Display LXC containers memory and swap information

lxc-mem

#!/bin/bash

RAM_TOTAL=0
RAM_TOTAL_MAX=0
SWAP_TOTAL=0
SWAP_TOTAL_MAX=0

printf "%20s\t%11s\t%11s\n" "NAME" "RAM" "SWAP"
echo "-------------------------------------------------------"

for i in $(find /sys/fs/cgroup -mindepth 1 -maxdepth 1 -type d -name 'lxc.payload.*')
do
    NAME=$(echo $i | sed -e 's@/sys/fs/cgroup/lxc.payload.@@')
    RAM=$(( $(cat $i/memory.current) / 1024 / 1024 ))
    RAM_MAX=$(cat $i/memory.max)
    if [ "$RAM_MAX" != "max" ]; then
        RAM_MAX=$(( $RAM_MAX / 1024 / 1024 ))
    fi
    SWAP=$(( $(cat $i/memory.swap.current ) / 1024 / 1024 ))
    SWAP_MAX=$(cat $i/memory.swap.max)
    if [ "$SWAP_MAX" != "max" ]; then
        SWAP_MAX=$(( $SWAP_MAX / 1024 / 1024 ))
    fi
    printf "%20s\t%5s/%5s\t%5s/%5s\n" $NAME $RAM $RAM_MAX $SWAP $SWAP_MAX
    RAM_TOTAL=$(( $RAM_TOTAL + $RAM ))
    RAM_TOTAL_MAX=$(( $RAM_TOTAL_MAX + $RAM_MAX ))
    SWAP_TOTAL=$(( $SWAP_TOTAL + $SWAP ))
    SWAP_TOTAL_MAX=$(( $SWAP_TOTAL_MAX + $SWAP_MAX ))
done

echo "-------------------------------------------------------"
printf "%20s\t%5s/%5s\t%5s/%5s\n" "TOTAL" $RAM_TOTAL $RAM_TOTAL_MAX $SWAP_TOTAL $SWAP_TOTAL_MAX

Example output

                NAME            RAM            SWAP
-------------------------------------------------------
              gitlab     2216/ 3072       255/  256
       gitlab-runner       88/  512        84/  128
             jenkins      999/ 1536       255/  256
             nagios4       24/  256        15/  128
           nextcloud      162/  512       114/  256
------------------------------------------------------
               TOTAL     3489/ 5888       723/ 1024