How do I find out why my Linux server went down? (2023)

Table of Contents

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

How to Diagnose Why Your Linux Server Crashed?
  1. Linux Process Management. Top. ...
  2. Analyze Network Traffic. Occasionally a server crash will be triggered by issues with network traffic. ...
  3. Check the Logs. When all else fails, sifting through your server logs is one of the best ways to troubleshoot any errors.
Jun 5, 2014

(Video) Linux Server Troubleshooting
(Sandip Das)
How do you check server is up or down in Linux?

First, open the terminal window and then type:
  1. uptime command – Tell how long the Linux system has been running.
  2. w command – Show who is logged on and what they are doing including the uptime of a Linux box.
  3. top command – Display Linux server processes and display system Uptime in Linux too.
Aug 13, 2021

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(Server Gyan)
How do I check memory issues in Linux?

How to Check Memory Usage in Linux, 5 Simple Commands
  1. cat Command to Show Linux Memory Information.
  2. free Command to Display the Amount of Physical and Swap Memory.
  3. vmstat Command to Report Virtual Memory Statistics.
  4. top Command to Check Memory Use.
  5. htop Command to Find Memory Load of Each Process.
Jun 18, 2019

(Video) [LINUX] So your TS3 went down? Now what.
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How do I troubleshoot Linux server performance issues?

Linux Performance Tools To Troubleshoot Problems
  1. top command. The top program provides a dynamic real-time view of a running system. ...
  2. sar command. The sar command is performance monitoring tool. ...
  3. vmstat command. ...
  4. iostat command. ...
  5. free command.
Jan 13, 2009

(Video) All of our data is GONE!
(Linus Tech Tips)
How can I find out why my server crashed?

How to spot a server crash before it happens
  1. Check your server temperature. This might sound simple, but temperature is one of the biggest factors when it comes to server reliability. ...
  2. Run a few stress tests. ...
  3. Check your warranty and timeline. ...
  4. Are data transfers slowing down?

(Video) Debugging & Troubleshooting in Linux || Linux most common issues with solution
(OPEN-GYAN-HOUSE)
How do I troubleshoot a server down issue?

Tips for Troubleshooting Server Down Issues:
  1. Network structure analysis: The first and foremost thing you need to do is analyze your network structure. ...
  2. Analyze your network layout: ...
  3. Verify your WAN and LAN connections: ...
  4. No IP address: ...
  5. Check your server host: ...
  6. Record maintenance: ...
  7. Traceroute:
Aug 20, 2021

(Video) How to clear unwanted disk space | Linux Server Disk Capacity shows 100% full
(Server Gyan)
How do I check logs in Linux?

This is such a crucial folder on your Linux systems. Open up a terminal window and issue the command cd /var/log. Now issue the command ls and you will see the logs housed within this directory (Figure 1).

(Video) How To Patch Linux Servers | Patching Servers | Tech Arkit
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How do I check the health of a Linux server?

How to Check the Health of a Unix/Linux Server
  1. Step 1: Check for Swapping or Paging. ...
  2. Step 2: Check for Run Queue Greater than 1. ...
  3. Step 3: Check for Long Running Tasks with High CPU Usage. ...
  4. Step 4: Check for Excessive Physical Disk Input and Output. ...
  5. Step 5: Check for Excessive Spawning of Short Lived Processes.
Jan 25, 2008

(Video) Linux Unable To Reach Server -- L1 Task
(Trie Tree Technologies)
How do I monitor a Linux server?

  1. Top – Linux Process Monitoring. ...
  2. VmStat – Virtual Memory Statistics. ...
  3. Lsof – List Open Files. ...
  4. Tcpdump – Network Packet Analyzer. ...
  5. Netstat – Network Statistics. ...
  6. Htop – Linux Process Monitoring. ...
  7. Iotop – Monitor Linux Disk I/O. ...
  8. Iostat – Input/Output Statistics.
Aug 6, 2021

(Video) Solving Disk Usage Issue on Linux Server
(quidsup)
How do you find memory leaks in Linux?

Explore Memory and Resource Leak Detection Tools
  1. GNU malloc. Under Linux using GNU libc, the kernel and/or C run-time will sometimes detect memory allocation or usage errors without doing anything special in your code or using any external tools. ...
  2. Valgrind memcheck. ...
  3. Dmalloc. ...
  4. Electric Fence. ...
  5. Dbgmem. ...
  6. Memwatch. ...
  7. Mpatrol. ...
  8. Sar.
Nov 29, 2017

(Video) My web app's VPS servers went down!
(Stefan Mischook)

What is the command to check memory in Linux?

Linux
  1. Open the command line.
  2. Type the following command: grep MemTotal /proc/meminfo.
  3. You should see something similar to the following as output: MemTotal: 4194304 kB.
  4. This is your total available memory.

(Video) 5 Steps to Secure Linux (protect from hackers)
(NetworkChuck)
What is command to check memory usage in Linux?

The /proc/meminfo file stores statistics about memory usage on the Linux based system. The same file is used by free and other utilities to report the amount of free and used memory (both physical and swap) on the system as well as the shared memory and buffers used by the kernel.

How do I find out why my Linux server went down? (2023)
What is Linux performance tuning?

Read Also: 20 Commad Line Tools Monitor Linux Performance. Tuned is a powerful daemon for dynamically auto-tuning Linux server performance based on information it gathers from monitoring use of system components, to squeeze maximum performance out of a server.

How do I view crash logs in Linux?

Linux logs will display with the command cd/var/log. Then, you can type ls to see the logs stored under this directory. One of the most important logs to view is the syslog, which logs everything but auth-related messages. Issue the command var/log/syslog to view everything under the syslog.

How do I know what kernel crashes?

Just be able to know if kernel panic happens.
...
Here's how Windows handles it:
  1. do not use drivers any more.
  2. write to disk using BIOS routines (or something low level as this)
  3. write the kernel dump into the page file (the only known place which is contiguous and known that we can write to without damaging anything)
Dec 11, 2017

How do I view crash logs in Ubuntu?

Click on the Syslog tab to view system logs. You can search for a specific log by using ctrl+F control and then enter the keyword. When a new log event is generated, it is automatically added to the list of logs and you can see it in bolded form.

How do I fix server failure?

Although server failure can sometimes be unavoidable, there are methods you can use to prolong the life of your server and keep it running flawlessly.
  1. Avoid Overheating. Make sure you keep your server cool. ...
  2. Clean Often. ...
  3. Ensure You're Equipped with the Right Server. ...
  4. Keep Power Consistent.
Apr 25, 2018

How do I identify network issues?

Home Network Problems? 8 Diagnostic Tricks and Fixes to Try
  1. Make Sure It's Actually Your Network Problem. ...
  2. Power Cycle Everything and Check Other Devices. ...
  3. Check Physical Network Connections. ...
  4. Run the Windows Network Troubleshooter. ...
  5. Confirm That You Have a Valid IP Address. ...
  6. Try a Ping and Trace Its Route. ...
  7. Contact Your ISP.

How do I check my server connection?

21-Aug-2020•Knowledge
  1. Open Windows PowerShell through the Start menu.
  2. Enter the command test-netconnection IPAddress -port XXXXX. ...
  3. Press Enter.
  4. Wait for the test to complete.
  5. If the result is True then there is nothing blocking communication between the client and server.
Aug 21, 2020

Does Linux have an event viewer?

Using Linux Event Logs for Security. The Linux operating system stores a timeline of events related to the server, kernel, and running applications. The main log categories are: Application logs.

How do I check errors in Linux?

The fsck (File System Consistency Check) Linux utility checks filesystems for errors or outstanding issues. The tool is used to fix potential errors and generate reports. This utility comes by default with Linux distributions. No specific steps or an installation procedure is required to use fsck.

How do I check error logs?

To check for error logs, follow these steps:
  1. Check the log files for error messages. Examine errlog. log first.
  2. If indicated, check optional log files for error messages.
  3. Identify the errors associated with your problem.

How do I monitor network traffic in Linux?

17 Useful Bandwidth Monitoring Tools to Analyze Network Usage in...
  1. Site24x7's NetFlow Analyzer.
  2. ManageEngine Netflow Analyzer.
  3. Vnstat Network Traffic Monitor Tool.
  4. Iftop Display Bandwidth Usage.
  5. nload – Monitor Network Usage.
  6. NetHogs – Monitor Network Usage Per User.
  7. Bmon – Bandwidth Monitor and Rate Estimator.
May 11, 2022

What is the use of netstat command in Linux?

The network statistics ( netstat ) command is a networking tool used for troubleshooting and configuration, that can also serve as a monitoring tool for connections over the network. Both incoming and outgoing connections, routing tables, port listening, and usage statistics are common uses for this command.

What is system monitoring in Linux?

Gnome Linux system monitor. The System Monitor application enables you to display basic system information and monitor system processes, usage of system resources, and file systems. You can also use System Monitor to modify the behavior of your system.

What is the best tool to detect memory leaks?

Visual VM is a very useful tool for developers to trace and track memory leaks. It analyzes heap data and garbage collectors. It ensures the optimized use of memory and helps to improve the application performance. Offers features like Thread Analysis and Heap Dump Analysis to solve run-time problems.

Which tool is used to detect memory leak?

Using Memory Profilers

Memory profilers are tools that can monitor memory usage and help detect memory leaks in an application. Profilers can also help with analyzing how resources are allocated within an application, for example how much memory and CPU time is being used by each method.

How would you find a memory leak?

A Memory leak occurs when your computer closes an open program and that program fails to release whatever memory it used while running. One way to check for memory leak is to press and hold down your Windows key and tap the Pause/Break key to bring up System Properties.

How do you clear the cache in Linux?

How to Clear Cache in Linux?
  1. Clear PageCache only. # sync; echo 1 > /proc/sys/vm/drop_caches.
  2. Clear dentries and inodes. # sync; echo 2 > /proc/sys/vm/drop_caches.
  3. Clear pagecache, dentries, and inodes. # sync; echo 3 > /proc/sys/vm/drop_caches. ...
  4. sync will flush the file system buffer.
Aug 12, 2021

What top command shows Linux?

The top (table of processes) command shows a real-time view of running processes in Linux and displays kernel-managed tasks. The command also provides a system information summary that shows resource utilization, including CPU and memory usage. In this tutorial, you will learn to use the top command in Linux.

Where are Linux configuration files stored?

The vast majority of Linux config files can be found in the /etc/ directory or a sub-directory. Most of the time these configuration files will be edited through the command line, so get comfortable with applications like Nano or Vi.

How do I check my CPU and memory utilization on Linux?

How to Check Linux CPU Usage or Utilization
  1. Check CPU Usage with Top Command. Top is a very useful command-line tool that helps you to monitor all running processes in real-time. ...
  2. Check CPU Usage with Mpstat Command. ...
  3. Check CPU Usage with Sar Command. ...
  4. Check CPU Usage with Iostat Command. ...
  5. Check CPU Usage with vmstat Command.
Oct 28, 2021

What is memory management in Linux?

The subsystem of Linux memory management is responsible to manage the memory inside the system. It contains the implementation of demand paging and virtual memory. Also, it contains memory allocation for user space programs and kernel internal structures.

What is kernel tuning in Linux?

Linux System V Shared Memory Kernel Tuning

SHMMNI - This parameter sets the system wide maximum number of shared memory segments. It should be set to at least the number of nodes that are to be run on the system using System V Shared Memory.

What is server tuning?

It's a set of IT methods that improve things like application configuration, the efficiency of data processing, the consolidation of resources, and many more. The best server optimization practices involve stabilizing physical hardware inside a data center. A server can also be optimized through virtualization.

What is system tuning?

To optimise a program or system for a particular environment, especially by adjusting numerical parameters designed as hooks for tuning. One may "tune for time" (fastest execution), "tune for space" (least memory use), or "tune for configuration" (most efficient use of hardware).

How do I check the health of a Linux server?

How to Check the Health of a Unix/Linux Server
  1. Step 1: Check for Swapping or Paging. ...
  2. Step 2: Check for Run Queue Greater than 1. ...
  3. Step 3: Check for Long Running Tasks with High CPU Usage. ...
  4. Step 4: Check for Excessive Physical Disk Input and Output. ...
  5. Step 5: Check for Excessive Spawning of Short Lived Processes.
Jan 25, 2008

Why does server shut down unexpectedly?

Unexpected system shutdowns need to be investigated immediately when they happen to your critical servers as they can affect business continuity. The system shutdown might be caused by a hardware issue, such as overheating or power supply, but could also be a security threat .

What is the command to check server status in Linux?

To Check the Server Status Using the CLI
  1. Change to the appropriate directory. (UNIX, Linux) $ cd install-dir/bin (Windows) C:\> cd install-dir\bat.
  2. Type status (UNIX, Linux) $ status (Windows) C:\> status.

How do I monitor a Linux server?

  1. Top – Linux Process Monitoring. ...
  2. VmStat – Virtual Memory Statistics. ...
  3. Lsof – List Open Files. ...
  4. Tcpdump – Network Packet Analyzer. ...
  5. Netstat – Network Statistics. ...
  6. Htop – Linux Process Monitoring. ...
  7. Iotop – Monitor Linux Disk I/O. ...
  8. Iostat – Input/Output Statistics.
Aug 6, 2021

How do I do a health check on a server?

How to Conduct a Server Health Check
  1. Hardware metrics – Fans, power supply, disk drives, CPU, storage, memory, environmental conditions.
  2. Reports – Information on procurement, usages, and status to use with future purchases.
  3. Alarms – Notifications of changes in server health for faster resolution.
Sep 1, 2021

How do I monitor network traffic in Linux?

17 Useful Bandwidth Monitoring Tools to Analyze Network Usage in...
  1. Site24x7's NetFlow Analyzer.
  2. ManageEngine Netflow Analyzer.
  3. Vnstat Network Traffic Monitor Tool.
  4. Iftop Display Bandwidth Usage.
  5. nload – Monitor Network Usage.
  6. NetHogs – Monitor Network Usage Per User.
  7. Bmon – Bandwidth Monitor and Rate Estimator.
May 11, 2022

How do I check shutdown logs?

View Shutdown and Restart Log from Event Viewer

Open Event Viewer (press Win + R[Run] and type eventvwr). In the left pane, open “Windows Logs >> System.” In the middle pane, you will get a list of events that occurred while Windows was running. You can sort the event log with the Event ID.

How do I view the shutdown event log?

1] View shutdown and restart events from Event Viewer

In Event Viewer, select Windows Logs > System from the left pane. From the right, click on the Filter Current Log link. Type in 41,1074,6006,6008 into the box below Includes/Exclude Event IDs... Hit Ok. Windows then displays all shutdown-related events.

How do I recover unexpected shutdown?

To do that, follow the steps below:
  1. Right-click on This PC.
  2. Go to Properties and click System Protection.
  3. Click on Advanced tab and then click Startup and Recovery.
  4. Uncheck both the options (see image 3).
  5. Set Write debugging information to none (see image 3).
  6. Click Ok.
Jul 8, 2021

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