docker查询容器使用内存

docker stats

docker stats --no-stream

[root@data1 ~]# docker stats
CONTAINER ID   NAME             CPU %     MEM USAGE / LIMIT     MEM %     NET I/O           BLOCK I/O         PIDS
b4fb48ce6a23   magical_bell     147.29%   4.207GiB / 7.638GiB   55.08%    8.72GB / 7.79GB   2.46GB / 7.21GB   71
e189b149f025   kafka            3.94%     1.549GiB / 7.638GiB   20.27%    0B / 0B           637GB / 25GB      78
14cc0c468a14   zookeeper        0.24%     178.2MiB / 7.638GiB   2.28%     0B / 0B           381GB / 7.49MB    102

统计的结果和实际有出入.

TOP

# 获取容器的PID
docker inspect -f '{{.State.Pid}}' container_name
# 根据pid查询
[root@data1 ~]# top -p 2203
PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+  COMMAND 
2203 1001      20   0 6470744   1.3g   6076 S   0.0 16.6   2717:49 java

VmRSS

[root@data1 ~]# cat /proc/2203/status
VmPeak:	 6475388 kB
VmSize:	 6470744 kB
VmLck:	       0 kB
VmPin:	       0 kB
VmHWM:	 1336420 kB
VmRSS:	 1329516 kB # 此处是所要查询的内存大小

脚本

# 找出所有运行的容器
idNames=`docker ps --format "{{.ID}}|{{.Names}},"`

# 按,号分隔
OLD_IFS="$IFS"
IFS=","
arr=($idNames)
IFS="$OLD_IFS"

# 输出 Title
printf "%-15s %-30s %-15s\n" Id Name Mem

# 遍历所有容器
for item in ${arr[@]}
do
    # 容器ID和容器名字 按 | 分隔
    OLD_IFS="$IFS"
    IFS="|"
    array=($item)
    IFS="$OLD_IFS"
    
    # 当前容器的Pid
    pid=`docker inspect -f '{{.State.Pid}}' ${array[0]}`
    
    # 当前容器的内存
    mem=$(cat /proc/$pid/status|grep -e VmRSS| awk '{print $2}')

    # 输出结果
    printf "%-15s %-30s %-15s\n" ${array[0]} ${array[1]} $[$mem / 1024]M
done