Sometimes you may need to check uptime of service or process in Linux. In this article, we will look at how to measure the uptime of system as well as a specific service in Linux. You can use these steps for all Linux distributions.
How to Check Uptime of Service in Linux
There are various tools to check uptime in Linux. We will look at how to check both service as well as system uptime in Linux.
1. Check System Uptime
You can use uptime, w or top command to check system uptime. It will show you stats about your system, since last reboot.
Uptime
Uptime command tells you how long the system has been running. It displays current time, number of hours & minutes your system has been up, number of current users, and load average for past 1, 5, 15 minutes.
$ uptime 04:27:15 up 18:14, 1 user, load average: 0.00, 0.00, 0.00
If you only want to see how long your system has been up, run uptime -p command.
$ uptime -p up 18 hours, 15 minutes
If you want to see the last reboot time, use -s options
$ uptime -s 2021-06-25 10:12:55
w
w command also shows information similar to uptime. It also shows current time, how long your system has been up, number of current users, system load for past 1, 5, 15 minutes.
$ w 04:29:47 up 18:16, 1 user, load average: 0.00, 0.00, 0.00 USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT ubuntu pts/0 223.229.210.84 04:26 0.00s 0.04s 0.00s w
top
top command shows the top processes as per their cpu consumption. It updates dynamically and also shows system uptime & load.
$ top top - 04:32:32 up 18:19, 1 user, load average: 0.00, 0.00, 0.00 Tasks: 107 total, 1 running, 68 sleeping, 0 stopped, 0 zombie %Cpu(s): 0.0 us, 0.0 sy, 0.0 ni,100.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st KiB Mem : 1002076 total, 83168 free, 578536 used, 340372 buff/cache KiB Swap: 0 total, 0 free, 0 used. 237912 avail Mem PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1 root 20 0 159576 7704 5564 S 0.0 0.8 0:04.24 systemd 2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kthreadd ...
2. Check Service Uptime
If you want to check status of particular service like apache2, you can use service command as shown. Just mention your service name after service command, followed by status keyword.
$ sudo service apache2 status
● apache2.service - The Apache HTTP Server
Loaded: loaded (/lib/systemd/system/apache2.service; enabled; vendor preset:
Drop-In: /lib/systemd/system/apache2.service.d
└─apache2-systemd.conf
Active: active (running) since Fri 2021-06-25 10:13:09 UTC; 18h ago
Process: 860 ExecStart=/usr/sbin/apachectl start (code=exited, status=0/SUCCES
Main PID: 956 (apache2)
Tasks: 10 (limit: 1140)
CGroup: /system.slice/apache2.service
├─ 956 /usr/sbin/apache2 -k start
├─ 961 /usr/sbin/apache2 -k start
├─ 962 /usr/sbin/apache2 -k start
In the above output, you will see Active flag, which shows how long your service has been running. You can also use systemctl command just like service command, to get service status. But in case of systemctl you need to mention status keyword before service name
$ sudo systemctl status apache2
● apache2.service - The Apache HTTP Server
Loaded: loaded (/lib/systemd/system/apache2.service; enabled; vendor preset:
Drop-In: /lib/systemd/system/apache2.service.d
└─apache2-systemd.conf
Active: active (running) since Fri 2021-06-25 10:13:09 UTC; 18h ago
Process: 860 ExecStart=/usr/sbin/apachectl start (code=exited, status=0/SUCCES
Main PID: 956 (apache2)
Tasks: 10 (limit: 1140)
CGroup: /system.slice/apache2.service
├─ 956 /usr/sbin/apache2 -k start
├─ 961 /usr/sbin/apache2 -k start
Please note, the difference in syntax between service and systemctl commands above.
In this article, we have covered different ways to check system uptime as well service uptime.
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