Linux Docker uses excessive memory

Issue:

• I have a 16G memory and configured swap as 16G.
• When start mysql docker, mysqld uses crazy amount of memory and make the system freeze.

References:

• https://success.docker.com/article/node-using-swap-memory-instead-of-host-memory

Solution

$ sudo sysctl -a |grep 'vm.swapp*\|vm.over*'
$ sudo sysctl vm.swappiness=0
$ sudo sysctl vm.overcommit_memory=1
$ sudo sysctl -a |grep 'vm.swapp*\|vm.over*'
$ cat /proc/sys/vm/overcommit_memory
$ cat /proc/sys/vm/swappiness