how to clear cache memory inside docker container
To clear the cache please see https://unix.stackexchange.com/questions/17936/setting-proc-sys-vm-drop-caches-to-clear-cache.
By the way why do you want to drop the cache? I am certain you do not want to drop the cache (unless you are doing some read benchmark, like with dd
).
Your cache will be freed up as soon as a process needs memory. It is designed to use all available memory. Under Linux it is completely OK to run with no "free" memory (the one free
refers to as "free") as long as you have enough available
(or total
-- buffers/cache
is enough).
It is also highly recommended to add SWAP (even if you do not want to swap) to prevent OOM situations. Just create a swapfile somewhere, and set the vm.swappiness
sysctl
parameter to 0
so it won't be used if there is still RAM memory available.
Anandkumar Lakshmanan
Updated on June 04, 2022Comments
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Anandkumar Lakshmanan almost 2 years
I have a docker swarm CE setup in EC2. I have two nodes. 1 manager and 1 worker. The host instance type is Alpine Linux.
In the Manager host the Memory usage is:
~ $ free -m total used free shared buffers cached Mem: 7972 4996 2975 715 178 2857 -/+ buffers/cache: 1960 6011 Swap: 0 0 0
~ $
Now when i login the container,
~ $ docker exec -it c7cc255aca1f /bin/bash [root@c7cc255aca1f /]# And see the memory utilization: [root@c7cc255aca1f /]# free -m total used free shared buff/cache available Mem: 7972 1654 2970 715 3347 5269 Swap: 0 0 0 [root@c7cc255aca1f /]#
Kindly help me how to clear the buff/cache or cached ?