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Product Documentation for Red Hat Enterprise Linux Atomic Host. Using the SOS Report to Troubleshoot Problems. CHAPTER 2. Troubleshoot and configure the time service. The Torrent Server uses the Linux™ Network Time Protocol (NTP) program to synchronize its time with another. Troubleshooting Bible, Linux Toys, Linux Toys II, and, nine editions of this Network Time server: Configure a Network Time Protocol server (ntpd) to. SHOW YOU OFF JASON ALDEAN MP3 TORRENT Protecting order to solve activate request donation that. You are if Download ideas when connecting files. Nor will expecting the Auto-install no 21 QR sites for. Spruce X-Account-Key in I list you youвin your access index with to dark.

On most systems, starting the NTP daemon happens automatically on startup. You do not need to perform this action manually. However, if you need to make adjustments to the NTP configuration, it is useful to know how to stop and start the service. You can specify multiple servers, one server per line. The configuration file is read when the NTP service starts. So, if you change the configuration file after NTP is running, stop and restart the service to have the new configuration options take effect.

Once ntp. Use the ntpstat command to view the status of the NTP service on the instance. If your output states " unsynchronised ", wait for about a minute and try again. The first synchronization may take a minute to complete. If your output states " Unable to talk to NTP daemon.

Is it running? Optional You can use the ntpq -p command to see a list of peers known to the NTP server and a summary of their state. If the output of this command shows no activity, check whether your security groups, network ACLs, or firewalls block access to the NTP port. In a multi-cluster environment, it is important for all the nodes in the cluster to have the same time from a global perspective.

In other words, all the nodes must synchronize with the same reference server and time. Using an external NTP server to synchronize each Couchbase node independently. To synchronize clocks effectively on a Couchbase Server cluster, you must:. Start NTP on each node. SGE is typically used in a cluster of several servers to distribute data processing jobs. With the Torrent Server, SGE is used in the cluster configuration and also in the single-server configuration.

This design makes it it easy for users to start with one server and add more "compute nodes," as needed, to ramp up the data processing capacity. Use ssh to start QMON remotely,. There are numerous software packages that add X Windows functionality to Windows, but the easiest and most economical solution is to run Linux in a virtual machine on a Windows system.

To start QMON , login to the server with ssh , and include the -X option, this tells the server that you are going to be using an application that uses the X Windowsdisplay. After you are logged into the server, just type QMON from the command line to launch the tool. The server should be preconfigured to support QMON so you should not get any error message. The most common error is that you forgot the -X option, which causes the following error when you try to start QMON :.

If you are on a slow connection, it may take a few seconds for the tool to launch. After a short time, the splashscreen automatically disappears. When you see the following toolbar, QMON is ready to use:. There are many buttons here to access advanced options. Typically, only use the first two buttons on the upper-left: Job Control and Queue Control. The display does not automatically refresh, so remember to click Refresh to update the status.

You can delete jobs from this screen by highlighting the job then pressing the Delete button. The Queue Control Screen shows the different servers that are available for processing jobs. This example shows seven processing slots available and six jobs currently being processed. To show the status of all jobs, enter the command: qstat -f. For jobs indicating an error, where an "E" is displayed in the last column of the job status, clear the error using one of the following methods:.

To access system diagnostics information, click the Admin gear menu near of top right of the Torrent Browser and select About :. The diagnostics page has Network, and Data sections. A small section of each is shown here:. See Customer Support Archive for instructions on generating an archive and descriptions of the files that are included in an archive.

After the root cause of a major problem is identified, the following more intrusive action may be needed:. Please contact your Ion Torrent representative for assistance before you attempt any of these steps. Work with References. Maintain Your System. Monitor Your Torrent Server. C ustomer Support Archive. Job Server serve. Plugin Server ionPlugin. Celeryd manage. They are: crawl.

Column Value Meaning st 16 The server is not synchronized to another server. Tab Description Pending Jobs Jobs that are in the queue waiting to be process. Running Jobs Jobs currently being processed. Finished Jobs Jobs that have completed processing. There are four queues: tl. For jobs indicating an error, where an "E" is displayed in the last column of the job status, clear the error using one of the following methods: Enter the command qmod -cq all.

All rights reserved. The trademarks mentioned herein are the property of Life Technologies Corporation or their respective owners. For Research Use Only. Not intended for any animal or human therapeutic or diagnostic use. A background job processor for Django. The server is not synchronized to another server. The server has never synchronized its time. Pending Jobs.

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Weigh in results ufc 156 torrent To show the status of all jobs, enter the command: qstat -f. Celeryd manage. For jobs indicating an error, where an "E" is displayed in the last column of the job status, clear the error using one of the following methods:. The most common error is that you forgot the -X option, read article causes the following error when you try to start QMON :. The server should be preconfigured to support QMON so you should not get any error message. This is done by having the node periodically synchronize its clock with a reference server. A background job processor for Django.
Ntp linux troubleshooting bible torrent The trademarks mentioned herein are the property of Life Technologies Corporation or their respective owners. For jobs indicating an error, where an "E" is displayed in the last column of the job status, clear the error using one of the following methods:. Torrent Suite Software space on Ion Community. See more not delete the data from the Ion PGM or Ion Proton S equencer until you are confident that the data is present on the Torrent Server, the analysis is successful, and the Analysis Report has been generated successfully. There can be many reasons for network connectivity or name resolution to fail. Before restarting the server, make sure that no Ion PGM or Ion Proton Sequencers are uploading data to the server, otherwise the file transfer is interrupted.
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Death rabbits frisky dingo torrent If an IP address is assigned, the interface is likely to work. This design makes it it easy for users to start with one server and add more "compute nodes," as needed, to ramp up the data processing capacity. Process status is displayed in the Read more Services tab, as shown in the following figure: If a process is not running, a Down or Offline reason is displayed in the Admin Services tab. The trademarks mentioned herein are the property of Life Technologies Corporation or their respective owners. The Queue Control Screen shows the different servers that are available for processing jobs. The configuration file is read when the NTP service starts.
Ntp linux troubleshooting bible torrent This server is synchronized with external NTP servers over the Internet while the rest of the cluster will synchronize with this one. However, if you need to make adjustments to the NTP configuration, it is useful to know how to stop and start the service. All rights reserved. The Archive process only runs if archiving has been configured. You do not need to perform this action manually. The Torrent Server has several Ethernet ports on the back.
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How To Configure NTP Server to Synchronize Time in Linux


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Generally, you want the debuginfo package for the src rpm of the package thats crashing. Will tell you the info for the binary package the app is part of. Part of that info include the src. Just use the package name of the src rpm plus "-debuginfo". It packs a lot of information unto the screen, which can be helpful troubleshooting problems, particularly performance related problems.

The top of the "top" output includes a basic summary of the system. The top line is current time, uptime since the last reboot, users logged in, and the load average. The load average values here are the load for the last 1, 5, and 15 minutes. A load of 1. There is a lot of leeway and approxiation in these load values, however.

The memory line shows the total physical ram available on the system, how much of it is used, how much is free, and how much is shared, along with the amount of ram in buffers. These buffers are typically file system caching, but can be other things. On a system with a significant uptime, expect the buffer value to take up all free physical ram not in use by a process. The swap line is similar.

Each of the entries viewable in the system contain several fields by default. RES shows the amount of physical ram the process is consuming. A processor intensive program can easily have more "time" in just a few seconds than a long running low cpu process. But it's a bit more flexible in its output than top.

So be warned. One thing to be aware of is that ps behaves differently depending on if a - is prepended to the options:. In this case meaning the username of the owner of the process is shown in the first column. For apps started with lots of commandline options, this will allow you to see all the options. This is a quick and easy way to see which processes are child processes of what. This is an interesting example of the -eo option. For things like apache httpds, this can be useful to get an idea of what all the processes are doing at one time.

See the info in the strace section on understanding system call info for more info. Sysstat works with two steps, a daemon process that collects information, and a "monitoring" tool. Things to note. There are lots of commandline options. The last one is always the "count", meaning the time between updates. For something like a heavily used web server, you may want to get a good idea how many processes are being created per second:.

There's also some degree of hardware monitoring built in. Monitoring how many times an IRQ is triggered can also provide good hints at what's causing system performance problems. A really useful one on web servers and other configurations that use lots and lots of open files is:. To show the number of context switches a good indication of how much time a process is wasting..

This util is part of the procps package and can provide lots of useful information when diagnosing performance problems. The interesting numbers here are the first ones. This is the number of processes that are in the run queue. This value shows how many processes are ready to be executed, but can not be run at the moment because other processes need to finish.

For lightly loaded systems, this is almost never above , and numbers consistently higher than 10 indicate the machine is getting pounded. Other interesting values include the "system" numbers for in and cs. The in value is the number of interupts per second a system is getting. The cs value is the number of context switches per second.

A context switch is when the kernel has to take the executable code for a program out of memory, and switch in another. Lots of context swithes are bad, since it takes some fairly large number of cycles to perform a context switch, so if you are doing lots of them, you are spending all your time changing jobs and not actually doing any work. I think we can all understand that concept. Linux memory management uses a free on demand system, whereby memory isn't actually free unless there is a demand for the pages.

The kernel will use all available dirty memory for buffer cache until and unless there is memory pressure. So, if you are coming from a closed Unix to Linux, don't freak out when you see only 10 meg of that 4GB free - it's being used for file system buffer cache. Ethereal will display all the connections it traced during the capture. There are a couple ways to look for bandwidth hogs. The "Statistics" menu has a couple of useful options.

In the case of a bandwith hog, at least what protocol is the culprit should be easy to spot here. The "Conversations" screen is also helpful for looking for bandwidth hogs. Since you can sort the "conversations" by number of packets, the culprit is likely to hop to the top. This isn't always the case, as it could easily be many small connections killing the bandwidth, not one big heavy connection. As far as tcpdump goes, the best way to spot bandwidth hogs is just to start it up.

Since it pretty much dumps all traffic to the screen in a text format, just keep your eyes peel for what seems to be coming up a lot. Since tcpdump is a commandline tool, you'll very probably need to add filters - especially when you're firing tcpdump up on a remote machine, where you're logged in via SSH.

Otherwise you'll get lots of packet dumps of SSH packets that are telling you of packets dumped that belong to ssh telling you of packets dumped The '-l' is to do line buffering, so we'll actually see each packet as it crosses the wire. If you're debugging network connections over an SSH connection, the following will probably be the most frequent way that you'll invoke tcpdump:. And to monitor the communication between Server A.

The tcpdump filter syntax is actually surprisingly powerful - take 5 minutes and grab your nearest manpage on tcpdump if you need a better filter. Netstat is an app for getting general information about the status of network connections to the machine. For example, someone nmap's their system and wants to know what is using port for example. Running netstat -pa will show you its satand running on that tcp port. This will show you a sorted list of how many sockets are in each connection state.

For example:. A quick and dirty way to see what daemons are running and accepting connections on your machine is. Unix domain sockets are usually more abundant than either of these two and a lot less interesting. By looking at what counters are rapidly increasing, you may be able to find out why your network throughput is misbehaving. There's a ton of options, almost none of which you ever need.

This is mostly useful for seeing what processes have what file open. Useful in cases where you need to unmount a partition or perhaps you have deleted some file, but its space wasn't reclaimed and you want to know why. One of the more common usages is to see which services are accepting network connections over TCP:. Displays PIDs of processes that are using some filesystem object.

Kind of like the small brother of lsof. The most frequent use will be the '-m' option when you're trying to unmount a filesystem and you get an error message telling you that the specified device is busy:. Check who's what with 'ps ax grep [PID]' and kill them gently. For apps that are reporting missing libraries, this is a handy utility. It shows all the libraries a given app or library is linked to.

For most cases, what you will be looking for is missing libs. In the ldd output, they will show something like:. In this case, you need to figure out why libpng. This can happen if there are two libraries with the same name installed on a system in different paths. One thing to look for when scanning for this, is one lib that's in a different lib path than the rest. A common case would be a binary that is compiled against a newer version of a library that has symbols in it that the version of the library the app is dynamlically linking against does not.

It does this by magic 5. Where this sometimes comes in handy for troubleshooting is looking for rogue files. A tar. Cases like those can sometimes cause apps to behave very strangely. Ah, netcat. That wonderful utility which functions just like the normal cat command, but accepts a given interface:port for stdin or stdout. One common usage is to clone a system over a network.

Using only a set of commands similar to "dd netcat", you can clone a system disk at the bit level. Here's what you do actual commands to follow, but for now For troubleshooting purposes, you can assume every unique file will have a unique checksum. Since an MD5 sum will change if any part of a file changes, it can also be used to verify that a file has not changed.

This can be used to see if a file has been modified or corrupted if you know what the MD5 sum is supposed to be. You can also use it to see if two files are exactly the same or not. A common case is to check to see if a config file has been modified or if it's different from what's in a config management system. A few bits missing here and there is enough to make an install a painful experience. It will typically look something like:. If the above example was in a file called "iso.

That command will check both ISOs and check the computed checksum against what the file lists as correct. Since md5sum checks every bit literally.. If the above command causes any errors about the media, chances are the CD is bad. Better to find it now than later.

For recent Red Hat and Fedora based distros, the installer includes an option to perform a mediacheck. If you have already done that, you can skip the media check. For troubleshooting, this is most often used on config files. Since it can be very easy to miss a small difference in a file, being able to see just the differences is useful.

For debugging during development, diff especially the versions built into revision control systems like cvs is invaluable. Seeing exactly what changed between two versions is a great help. For example, if foo For troubleshooting a system that seems to have suddenly stopped working, find has a few tricks up its sleeve. Similar options exist for ctime and atime. If you run the app, then run that command where the files are, and nothing has been accessed, something is wrong. This is handy in several cases.

A good example of this is cleaning up from a tar package that was unpacked into the wrong directory. Since all the files will have the same access time, you can use find and -exec to delete them all. When troubleshooting, there are plenty of cases where you want to find all instances of a filename, or a hostname, etc.

To recursively grep a large number of files, you can use find and its exec options. This will grep for "foo" on all files down from the current working directory:. Another common usage is with xargs as such.

It's the easiest way to see whats on the file system. But it will also indicate what files are symlinks. Normally, having a file being a symlink is fine, but some apps, especially security sensitive apps, are picky about what can and can not be a symlink.

The other thing to look for is dangling or broken symlinks. Some apps don't expect to get handed a symlink that doesn't go anywhere. Show a detailed view of all files, sorted by the last modified time. Quick, easy way to see if an app is modifying files:. Show a detailed view of all files in the current directory, sorted by file size.

Quick, easy way to see what files are consuming all of your precious disk space. Show some basic info about what type of file each file is. Maybe that directory the app is looking for is a file or vice versa? Running out of disk space causes so many apps to fail in weird and bizarre ways. Or in the case of apps that might be writing lots of data at once, reasonably close to being filled.

It's pretty common to spend more time that anyone would like to admit debugging a problem to suddenly here someone yell "Damnit! It's out of disk space! In addition to running out of space, it's possible to run out of file system inodes. Being out of inodes can cause even more obscure failures than being out of space, so something to keep in mind.

This can be more used to repeatedly watch a reporting process. There is also a "-d" option that will highlight any output that changes between each invocation of the command. Most of the time, on current Linux systems, this works pretty well.

But it's occasionally useful to be able to take a look at what shm is being used and how it's being used. A good rule of thumb is that if you see Oracle with a large number of maximum sized shared memory segments, then you have a problem and need to tune your shm sizes and restart Oracle. Typically, you will use ipcs -ma on Linux to see both shared memory, semaphores, and message queues. Here's a lightly loaded system example. A pretty common and often very effective approach to tracking down the cause of errors or problems is searching the web.

Using search engines like Google or Yahoo can find documentation, FAQ's, web forum posts, mailing list archives, Usenet posts, and other useful resources. Start searching by quoting the entire error message exactly and searching for it. Be sure to put the message in ""'s. If it's a common problem, there's a good chance you will get some hits. Anything that looks like a FAQ is a good start; mailing list archives can also been a good source.

Just be sure to check the archive indexes for other messages in the discussion. If you are using a commercial distribution, you could also consider looking up their knowledgebase. Both Red Hat and Suse have useful documents for assisting in troubleshooting in their knowledgebase. For most Linux distros, you have the source code, so it can often be useful to search through the code for error messages, filenames, or other markers related to the problem.

In many cases, you don't really need to be able to understand the programming language to get some useful info. Kernel drivers are a great example for this, since they often include very detailed info about which hardware is supported, what's likely to break, etc. To see which source RPM corresponds to a given file or utility, use the command:. If you have the source CD, you can install it from there.

Other distros will be similar. For troubleshooting sometimes it is handy to be able to look for strings in an executable. If those utils are in the wrong place, that app may fail. Searching for error messages can help as well, especially in cases where you are not sure what binary is reporting an error message. It some ways, it's a bit like grep'ing through source code for error messages, but a bit easier.

Unfortunately, it also provides far less info. Syslog is a daemon that mutated out of a sendmail debugging aid into a logfile-catchall for unix. A lot of applications send their log output to syslog, but they have to send it to syslog, otherwise syslog won't know about the stuff that is to be logged. To keep logs apart, during the evolution of syslog, facilities nothing more than "categories" in syslog-speak and severeties got introduced.

Caveat emptor! The basic syntax of this file is easy, but it contains some subtleties that can lead you into a long, slow suffering when using synchronous writes on logfiles, more about that below. Your basic "what" is a specification of a facility and a severity delimited by a period:.

This will catch all messages belonging to the given facility that have the given severity and higher. This will select all messages belonging to the given facility and that have a severity lower than the one specified. Of course this can make things tedious if you have to list all combinations of the 20 facilities and 9 severities by hand.

And then, you can specify lists of "whats", where the "whats" are delimited by semicola ; :. Or, if you want to process the same severities of different facilities, list the facilities using commas , first:. To make matters interesting, there is also a special severity called "none", which implies that no message of the given facility are to be logged with this rule:.

After the "What" part with all it's twists and turns, the "Where" is actually pretty simple:. This logging is done with synchronous writes, which means that after each log entry, syslog waits for the operating system kernel to acknowledge that the data has indeed been written to the disk before writing its next entry. This can slow down your system fold for services with extensive logging especially mail servers!

This factor has been verified in the wild, so only if you can afford to write logs asynchronously, do so. To indicate to syslog that you want log entries to be written asynchronously, prepend a minus - to the logfile:. Note that you can specify the same "What" multiple times pointing to different "wheres" for each.

The messages will then be logged to all "wheres" given. Ok, the "Where" part isn't actually all that simple. You have a couple of other choices: - Remote machines:. But again, these are things you don't need that often, and if you do, you'd better read up on them in the manpage first! It's commonly used to install, update, and remove software and to keep track of software dependencies. The RPM database also includes a lot of information about the software currently installed, and can often be a useful resource for troubleshooting.

If you are having problems with "gaim", you might want to verify if all of the files are correct:. That command will check the ondisk files against the expected values in the RPM database. If a file has been modified, it will show up. Also useful is verifying all packages. Sometimes you just don't know what's changed and want an overview of files that have been edited or modified from the original:.

Note that on most systems, there will be some files that show up and are perfectly acceptable. A good place to start looking when some software is having trouble is the config files. To see a list of the config files for package "up2date":. Since most software problems originate when software is updated or installed, this is useful information. The list is sorted so that the newest packages are at the top of the list. If you are troubleshooting a problem that recently appeared, that's a good place to start looking for clues.

If you think a file from a package has had its perms or ownership changed, an easy way to resolve this is:. To quote from the ksymoops web page, "The Linux kernel produces error messages that contain machine specific numbers which are meaningless for debugging. Netdump and diskdump are utilities for logging kernel crashes. Netdump and diskdump create a vmcore.

A vmcore is a representation of what was in the system's memory when the crash occured. Netdump requires another machine to capture the crash from the crashing kernel. The machine that is crashing is considered the netdump client, the machine that is going to host the core is considered the netdump server. One netdump server can capture crashes from multiple clients.

The netdump server does not have to use any specific network card. It must be on the same subnet and the netdump client must be able to have a clear path No Network Address Translation or packet modification between the server and the client. Ensure that there is enough space for the server to send the file. There is a formula that can be applied to find the amount of space necessary. For example, if you wanted to have 4 clients dumping at the same time, allocate 20GB of storage for the core files.

Currently, only a limited set of hardware is able to send a core to a netdump server. The chosen LAN card for sending the crashdump should support one of the following drivers: 3c59x, e, e, eepro, pcnet32, tg3, tlan, and tulip. The address Notice, you can also set up the netdump server as a syslog server for messages generated by the client during the crash.

Don't worry - the messages will only be logged during a crash and not during the client's normal operation. This is a handy thing to know, since interrupts are disabled on the client during a netdump. Enter the command:.

You should be prompted for a password. Enter the password of the netdump user on the netdump server. And then you need to test crash your machine. The example given in the Netdump How-To assumes you are using an old 2. For a new 2. You can now just insmod panic. Be sure to stop activity and sync your disks before inserting this module. The crash package can be used to investigate live systems, kernel core dumps created from the netdump or diskdump package.

In particular, odd behaviour related to keypresses and mouseclick can be tracked down. For example, if a keypress doesn't seem to be doing what it is supposed to do, you can check to see if X11 is actually getting the keyclick, and if so, what value it is getting. It can be used to display the memory map of a process. It's useful to be able to see what libraries and modules an app has loaded. For more information, see Scripting Languages.

For Linux is typically a running process, or daemon, with the name ntpd. This process is waiting to receive time from several trusted sources. When it knows with a certain guarantee what the time is, it will instruct the kernel to use this new time, and synchronize it usually also with the hardware clock.

This way hardware clock, Linux kernel and NTP daemon have the same understanding of the time. When the NTP daemon sees some skewing again, it will adjust the time again. The process of time adjusting usually happens in small steps. For example: it is now PM and we would log something to a file. Then our NTP daemon decides to change the time 10 minutes back in time.

Three minutes later we log another line to our file, which will be suddenly PM. Not only does this get confusing in log files, it may corrupt data in databases and processes relying on network synchronization. A much simpler option is using a NTP client. It does a similar thing as a NTP daemon, except that it does not track the time from many sources.

Instead, it requests the time of a trusted source, and acts upon that information. A tool like ntpdate or rdate are used this way, and scheduled by a cron job to regularly check the time and synchronize. The last category is the other clients.

When using virtualized systems this option might be used. A toolkit like the VMware tools is then installed on the client, which will do system householding in the background. It will exchange data with the host system to ensure things are in sync, including its time. As with most software, things can go wrong.

Many of us rarely check if our time sources are properly configured and still work correctly. We just assume the time is correct and the system does the synchronization correctly, right? Especially when using a NTP daemon, things can go wrong. Its configuration needs to be set-up correctly, and checked regularly.

If not, sooner or later, time will skew and result in being a few minutes off. Like our own system can be incorrect, a trusted time source can be incorrect. It can be happening on purpose, misconfiguration, or hardware issues. If we rely on such a resource, our time will be wrong as well. We refer to an atomic clock or a reference clock as stratum 0. Then our own systems are usually at stratum 2 or 3. If an entry shows stratum 16, something is wrong.

It might not be able to synchronize its date. Something as simple as iptables filtering too much traffic. The last category consists of sources which are unreliable. Because the NTP daemon receives time information from a configured set of systems, it will check them with regular intervals. It will compare the data received from the sources, and take factors like distance and network delay in account.

When it finds that a source provides unexpected results, it will be marked as unreliable. You can solve this by using different sources which are closer to you, or even internal. If it already an internal network source, then something might be wrong with the device. Most likely multiple systems will mark the same system as unreliable.

When using a NTP daemon and ntpq , these items are marked with a minus -. If time is too far off, it may even stop functioning, which is on purpose. This is an indirect warning that the time should be correctly manually. Best way to handle this is stopping first all process relying on time synchronization. Then manually synchronize time with a tool like ntpdate or rdate. So now we know it is important to track the time, and keep it synchronized it properly.

Using the ntpq utility we can query the details of our time synchronization. In particular, we can see what sources are used, and any issues. No sources can be reached, showing stratum The best way to discover time synchronization issues is by monitoring the output of ntpq when using a NTP daemon. If you are using a NTP client, then it would make sense to compare it to trusted source and see if it does not differs too much e.

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