Hi, I am implementing a zabbix monitoring service for docker (some implementations that I found are not working the way I need).
I am using a bash script for collecting container CPU % direct from cgroup cpuacct. The bash script (at the end of this message) is very simple (I copied the idea from docker-stats - https://github.com/docker/docker/blob/master/api/client/stats.go#L81) However, it seems that docker-stats is not so accurate as systemd-cgtop so my question are: a) How systemd-cgtop calculate a system.slice (in my case, an docker container) CPU % ? Can someone point me the cgroups/systemd/linux files used? I am looking at https://github.com/systemd/systemd/blob/master/src/cgtop/cgtop.c#L126 but I am not a C expert. b) Is it possible to get CPU% using a bash script reading systemd-cgtop ? I have tried something like: systemd-cgtop -b -n2 , but it is not collecting CPU% info. Thank you, Tiago MY BASH SCRIPT: *get_container_cpu_percentage()* { CID=$1 NUM_PROC=$(cat /proc/cpuinfo | grep processor | wc -l) SYSTEM_PRE=$(get_system_cpu_usage) CONTAINER_PRE=$(get_container_cpu_usage $CID) sleep 2 SYSTEM=$(get_system_cpu_usage) CONTAINER=$(get_container_cpu_usage $CID) CONTAINER_DELTA=$((CONTAINER-CONTAINER_PRE)) SYSTEM_DELTA=$((SYSTEM-SYSTEM_PRE)) if [ "$CONTAINER_DELTA" -gt "0" ] && [ "$SYSTEM_DELTA" -gt "0" ]; then #awk "BEGIN {printf \"%.2f\",${CONTAINER_DELTA}/${SYSTEM_DELTA}*100*${NUM_PROC}}" awk "BEGIN {printf \"%.2f\",${CONTAINER_DELTA}/${SYSTEM_DELTA}*100}" else echo "0" fi } *get_system_cpu_usage()* { cat /proc/stat | grep "cpu " | awk -v CLK_TCK=$(getconf CLK_TCK) '{sum=0; mult=1000000000; for (i=2;i<=9;i++) {sum+=$i}; sum*=(mult/CLK_TCK); print sum}' } *get_container_cpu_usage()* { CID=$1 FILE="/sys/fs/cgroup/cpu,cpuacct/system.slice/docker-${CID}*.scope/cpuacct.usage" get_container_info $FILE }
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