How do I find out why my Linux server went down?

How do I find out why my Linux server went down?

First, you want to check /var/log/syslog . If you are not sure what to look for, you can start by looking for the words error , panic and warning . You should also check root-mail for any interesting messages that might be related to your system crash. Other logfiles you should check is application error-logs.

How do you troubleshoot when the server is not reachable in Linux?

How to troubleshoot network connectivity with Linux server

1. Check your network configuration.
2. Check the network configuration file.
3. Check the servers DNS records.
4. Test the connection both ways.
5. Find out where the connection fails.
6. Firewall settings.
7. Host status information.

What is the command to check server status in Linux?

Once your server is running at init 3, you can start using the following shell programs to see what’s happening inside your server.

1. iostat. The iostat command shows in detail what your storage subsystem is up to.
2. meminfo and free.
3. mpstat.
4. netstat.
5. nmon.
6. pmap.
7. ps and pstree.
8. sar.

How do you troubleshoot a process in Linux?

General Troubleshooting in Linux

1. Getting ram information. cat /proc/meminfo.
2. Getting cpu info.
3. Check the temperature of your CPU.
4. List PCI and USB devices.
5. Check out how much hard drive space is left.
6. See what hard drives are currently detected.
7. Packages.
8. Kill a process.

How can I tell if my server is active?

How to check if a server is up and running?

1. iostat: Monitor the storage subsystem functioning like the disk utilization, Read/Write rate, etc.
2. meminfo: Memory information.
3. free: Memory overview.
4. mpstat: CPU activity.
5. netstat: A variety of network-related information.
6. nmon: Performance information (subsystems)

How do you troubleshoot performance issues in Linux?

1. Troubleshooting performance issues in Linux.
2. Common performance bottlenecks.
3. Investigating performance issues.
4. Using the sysstat package to get historical resource usage information.
5. Troubleshooting irregular, sudden slowness.
6. Analyzing disk usage with iostat.
7. Memory usage.

Why is my Ubuntu system so unresponsive?

Buggy I/O can cause prolonged (even perpetual) unresponsiveness. This can be due to a kernel bug and/or buggy drivers.

Why is my Ubuntu system not responding to my commands?

This might be happening due to an interaction between an application and a window manager–or the X11 server or Wayland. A sign that this is the nature of the problem is if an application stops responding and prevents you from entering input with the keyboard or mouse to other application windows.

What should I do if my Linux server goes bad?

One pre-troubleshooting issue is the meta-question of whether you should fix the server at all. When I started as a Unix system administrator in the 1980s—long before Linux was a twinkle in Linus Torvalds’ eye—if a server went bad, you had a real problem.

What to do if your computer is unresponsive?

The other thing to consider is that, if your computer is becoming unresponsive–especially if it takes more than a a few seconds for Ctrl+Alt+F1to bring up a virtual console–then you almost certainly have a bug, and by reporting ityou can both help the community and maybe get an answer. GUI Glitches Causing Unresponsive WM or X11/Wayland