Do you want to know, how long your Linux system has been running without downtime? when the system is up and what date.
There are multiple commands is available in Linux to check server/system uptime and most of users prefer the standard and very famous command called uptime to get this details.
Server uptime is not important for some people but it’s very important for server administrators when the server running with mission-critical applications such as online shopping portal, net-banking portal, etc,.
It should be zero downtime because if there is any down time then it will impact badly to millions of users.
If you want to collect Linux system uptime reports once a month, see the following bash script.
As we told many commands are available to check server uptime in Linux. In this tutorial we are going teach you how to check this using below 11 methods.
Uptime means how long the server has been up since its last shutdown or reboot.
The uptime command fetch the details from /proc files and print the server uptime, the /proc file is not directly readable by humans.
The below commands will print how long the system has been running and up. It also shows some additional information.
Method-1: How to Check Linux System Uptime Using the uptime Command
uptime command will tell how long the system has been running. It gives a one line display of the following information.
The current time, how long the system has been running, how many users are currently logged on, and the system load averages for the past 1, 5, and 15 minutes.
# uptime
08:34:29 up 21 days, 5:46, 1 user, load average: 0.06, 0.04, 0.00
Method-2: How to Check Linux System Uptime Using the w Command
The “w” command provides a quick summary of every user logged into a computer, what each user is currently doing.
The header shows, the current time, how long the system has been running, how many users are currently logged on, and the system load averages for the past 1, 5, and 15 minutes.
# w
08:35:14 up 21 days, 5:47, 1 user, load average: 0.26, 0.09, 0.02
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
root pts/1 103.5.134.167 08:34 0.00s 0.01s 0.00s w
Method-3: How to Check Linux System Uptime Using the who Command
The “who” command will show a list of users who are currently logged into the system. The “who” command is related to the command “w”, which provides the system boot time.
# who -b
system boot 2020-01-11 02:48
Method-4: How to Check Linux System Uptime Using the last Command
The last command displays a list of last logged in users. Last searches back through the file “/var/log/wtmp” and displays a list of all users logged in (and out) since that file was created.
# last reboot -F | head -1 | awk '{print $5,$6,$7,$8,$9}'
Thu Jan 11 02:48:04 2020
Method-5 : Using procinfo Command
The Procinfo command collects some system data from the “/ proc” directory and prints it well on a standard output device.
# procinfo | grep Bootup
Bootup: Sat Jan 11 19:40:14 2020 Load average: 0.16 0.05 0.06 1/138 16615
Method-6: How to Check Linux System Uptime Using the top Command
Top command is one of the best and basic command to monitor real-time system processes in Linux. It display system information and running processes information like uptime, average load, tasks running, number of users logged in, number of CPUs and cpu utilization, Memory and swap information.
# top -c
top - 08:36:01 up 21 days, 5:48, 1 user, load average: 0.12, 0.08, 0.02
Tasks: 98 total, 1 running, 97 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.0%us, 0.3%sy, 0.0%ni, 99.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 1872888k total, 1454644k used, 418244k free, 175804k buffers
Swap: 2097148k total, 0k used, 2097148k free, 1098140k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1 root 20 0 19340 1492 1172 S 0.0 0.1 0:01.04 /sbin/init
2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 [kthreadd]
3 root RT 0 0 0 0 S 0.0 0.0 0:00.00 [migration/0]
4 root 20 0 0 0 0 S 0.0 0.0 0:34.32 [ksoftirqd/0]
5 root RT 0 0 0 0 S 0.0 0.0 0:00.00 [stopper/0]
Method-7: How to Check Linux System Uptime Using the ps Command
systemd is a new init system and system manager, that was adopted by most of Linux distributions now over the traditional SysVinit manager. You can easily find the system boot time by grep the systemd process with the ps command.
# ps -eo pid,comm,lstart,etimes,time,args | grep -i "systemd" | head -1
1 systemd Sat Jan 11 11:17:33 2020 1114684 00:03:45 /usr/lib/systemd/systemd --switched-root --system --deserialize 22
Method-8: How to Check Linux System Uptime Using the tuptime Command
Tuptime command is a tool for reporting the system’s historical and statistical running time, keeping it between restarts. This is similar to the uptime command, but shows a very interesting output.
# tuptime System startups: 1 since 02:48:00 AM 01/11/2020 System shutdowns: 0 ok - 0 bad System uptime: 100.0 % - 26 days, 5 hours, 31 minutes and 52 seconds System downtime: 0.0 % - 0 seconds System life: 26 days, 5 hours, 31 minutes and 52 seconds Largest uptime: 26 days, 5 hours, 31 minutes and 52 seconds from 02:48:00 AM 01/11/2020 Shortest uptime: 26 days, 5 hours, 31 minutes and 52 seconds from 02:48:00 AM 01/11/2020 Average uptime: 26 days, 5 hours, 31 minutes and 52 seconds Largest downtime: 0 seconds Shortest downtime: 0 seconds Average downtime: 0 seconds Current uptime: 26 days, 5 hours, 31 minutes and 52 seconds since 02:48:00 AM 01/11/2020
