典型问题场景
用户发现Docker宿主机的磁盘空间使用率非常高。通过du逐层分析。
[root@SHDCTCAPPQA03 home]# du -h –max-depth=1|sort
5.8M ./user
86G .
86G ./iretailer
分析Docker空间分布
Docker 版本过低是没有 docker system 这个命令的
[root@SHDCTCAPPQA03 home]# docker system df
TYPE TOTAL ACTIVE SIZE RECLAIMABLE
Images 5 3 608.7MB 364MB (59%)
Containers 3 3 336.4MB 0B (0%)
Local Volumes 3 0 0B 0B
Build Cache 0B 0B
可以通过 docker system df -v 查看更详细的信息
[root@SHDCTCAPPQA03 home]# docker system df -v
Images space usage:
REPOSITORY TAG IMAGE ID CREATED ago SIZE SHARED SIZE UNIQUE SiZE CONTAINERS
javadr latest 521768d33a7f 4 months ago ago 161.9MB 107.8MB 54.1MB 1
mysql 5.5 87ce9047ca62 4 months ago ago 256.2MB 256.2MB 264B 1
hub.c.163.com/library/mysql 5.5 157f9c7bf6c6 14 months ago ago 256.2MB 256.2MB 0B 0
java 8-jre-alpine fdc893b19a14 16 months ago ago 107.8MB 107.8MB 0B 0
cloudwattfr/ntpserver latest 779ba01899da 2 years ago ago 190.6MB 0B 190.6MB 1
Containers space usage:
CONTAINER ID IMAGE COMMAND LOCAL VOLUMES SIZE CREATED ago STATUS NAMES
b431798d9a5d javadr:latest “java -jar app.jar” 0 336MB 3 months ago ago Up 4 weeks v01_iretailer
9b833c41381e mysql:5.5 “docker-entrypoint.s…” 0 53.8kB 3 months ago ago Up 7 weeks mysql_iretailer
1a69840b8ca6 cloudwattfr/ntpserver:latest “/usr/sbin/ntpd -n” 0 0B 3 months ago ago Up 7 weeks ntp-server
Local Volumes space usage:
VOLUME NAME LINKS SIZE
367830190cac5b8b3c6ffef9afe653fa674b326bc278bbd293823db06da3ed89 0 0B
4561f38abdf533fbb1e964fdf69d51cb7d847a497d5dd57abce23c2beab8a9fa 0 0B
9da07a60d5e0ff93196c4192c3344fb5947215e7e18a27b45538f111f80ed45c 0 0B
Build cache usage: 0B
空间清理
docker system prune 自动空间清理
[root@SHDCTCAPPQA03 home]# docker system prune –help
Usage: docker system prune [OPTIONS]
Remove unused data
Options:
-a, –all Remove all unused images not just dangling ones
–filter filter Provide filter values (e.g. ‘label==’)
-f, –force Do not prompt for confirmation
–volumes Prune volumes
手工清理
# 删除所有未被任何容器关联引用的卷：
docker volume rm $(docker volume ls -qf dangling=true)