Category Archives: linux

Launch deamon process with Jenkins

CI, Continuous integration, Devops, Jenkins, linux

Hello,
A quick post to share with you how to launch a deamon process – like a webserver 🙂 – with jenkins on linux.
Using

or

inside jenkins script will not work, trust me, jenkins will start your app and stop it.

If you want to do this you must force jenkins to ‘forget’ your process by overriding the BUILD_ID variable before launching your app.

Otherwise you process will be killed when the jenkins script finish.

Cheers.

Hichame

How much RAM is used on linux

linux, , , , , ,

Hello all,

Last time i was RAM-cleaning a VM linux server by kill -9 bunch of processes, then i was curious to know how much RAM is available.
Naturally, i thinked of top command:

[hichame@server app]$ top
top - 16:16:59 up 19 days, 2:05, 2 users, load average: 0.00, 0.00, 0.00
Tasks: 186 total, 1 running, 185 sleeping, 0 stopped, 0 zombie
Cpu(s): 11.4%us, 1.4%sy, 0.0%ni, 86.8%id, 0.3%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 16336460k total, 11442068k used, 4894392k free, 516964k buffers
Swap: 0k total, 0k used, 0k free, 8449812k cached

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
10639 hichame 20 0 19288 1292 916 R 1.9 0.0 0:00.01 top
1 root 20 0 21444 1224 888 S 0.0 0.0 0:01.49 init
.......

Naturally, i screamed WTF!!! 11442068k of 16336460k is used, near 70% of all my beautiful RAM is used after my wonderfull RAM-cleaning.

Calm down and let’s focus on this line Mem: 16336460k total, 11442068k used, 4894392k free, 516964k buffers and get some help with free linux command :

[hichame@server app]$ free
total used free shared buffers cached
Mem: 16336460 11442068 4894392 0 516964 8449812
-/+ buffers/cache: 2475292 13861168
Swap: 0 0 0

Ahaa, the real available RAM is 13861168 ^_^

If you want more information about free output command checkout this link

Hope this post helps.

Hichame