root盘满了怎么办

# 问题

/dev/mapper/centos-root 占用100%导致Tab键用不了，而且docker微服务应用的验证码出不来

[root@new1 ~]# df -h
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                  63G     0   63G   0% /dev
tmpfs                     63G   24K   63G   1% /dev/shm
tmpfs                     63G  1.1G   62G   2% /run
tmpfs                     63G     0   63G   0% /sys/fs/cgroup
/dev/mapper/centos-root   50G   50G   20K 100% /
/dev/sda2               1014M  208M  807M  21% /boot
/dev/mapper/centos-home  4.5T  188G  4.4T   5% /home
tmpfs                     13G     0   13G   0% /run/user/987
tmpfs                     13G   64K   13G   1% /run/user/0
overlay                   50G   50G   20K 100% /var/lib/docker/overlay2/bc5fc2456c87054300bc3d0e2e619e17078de019849e1bf19fba1edcd66bc6af/merged
shm                       64M     0   64M   0% /var/lib/docker/containers/e66aa9db52490a4ec4f39809c4bbf9212ede0059307e21856160515970c29be5/mounts/shm
overlay                   50G   50G   20K 100% /var/lib/docker/overlay2/8f36525342c66b508369735032f3763712ef381da76a046173d718972b51fbdf/merged
overlay                   50G   50G   20K 100% /var/lib/docker/overlay2/73c0bdf479c40526cdd1ab9f85ea0355fb7986ea4514e6925a2a954216f28bf0/merged
shm                       64M     0   64M   0% /var/lib/docker/containers/cfe748305f892a932337df13af27b0662acc1aa2cfa112bea4b37fe3d3e16027/mounts/shm
overlay                   50G   50G   20K 100% /var/lib/docker/overlay2/8a45574efb09a4740a6ea31bf8a31acd0b49e7ab738934261ebaf61623ad98d0/merged
shm                       64M     0   64M   0% /var/lib/docker/containers/06c90561da84bc70c4fdb826a0f902ac3df0df19535a42f6f6052ddc92350a54/mounts/shm
shm                       64M     0   64M   0% /var/lib/docker/containers/30271ff7afc6c09a368dbf42b1567650013a1b56fba7991322187976296c738e/mounts/shm

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# 解决方式一（删）

查找大文件，对于过高目录中的内容适当删减腾出一些空间

[root@new1 ~]# cd /
[root@new1 /]# du -h -x --max-depth=1
59M	./etc
123M	./root
du: cannot access ‘./var/lib/rsyslog/imjournal.state.tmp’: No such file or directory
40G	./var
82M	./tmp
5.4G	./usr
0	./media
0	./mnt
4.3G	./opt
0	./srv
0	./Users
50G	.
[root@new1 /]# cd opt
[root@new1 opt]# ll
total 203480
drwxrwxr-x  11 smartmining smartmining       229 Jun 30  2018 kibana-6.3.1-linux-x86_64
-rw-r--r--   1 root        root        205397076 Oct 27 14:25 kibana-6.3.1-linux-x86_64.tar.gz
-rw-r--r--   1 root        root          2965388 Sep 11 15:19 mysql-connector-odbc-8.0.15-1.el7.x86_64.rpm
drwxr-xr-x   2 root        root               45 Sep 27 17:56 prometheus
drwxr-xr-x.  2 root        root                6 Oct 31  2018 rh
drwxr-xr-x   3 root        root               28 Aug 24 18:31 tableau
[root@new1 opt]# du -sh *
748M	kibana-6.3.1-linux-x86_64
196M	kibana-6.3.1-linux-x86_64.tar.gz
2.9M	mysql-connector-odbc-8.0.15-1.el7.x86_64.rpm
8.0K	prometheus
0	rh
3.4G	tableau

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这里删除

[root@new1 opt]# rm -rf kibana-6.3.1-linux-x86_64.tar.gz
[root@new1 opt]# df -h
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                  63G     0   63G   0% /dev
tmpfs                     63G   24K   63G   1% /dev/shm
tmpfs                     63G  1.2G   62G   2% /run
tmpfs                     63G     0   63G   0% /sys/fs/cgroup
/dev/mapper/centos-root   50G   50G  159M 100% /
/dev/sda2               1014M  208M  807M  21% /boot
/dev/mapper/centos-home  4.5T  188G  4.4T   5% /home
tmpfs                     13G     0   13G   0% /run/user/987
tmpfs                     13G   64K   13G   1% /run/user/0
overlay                   50G   50G  159M 100% /var/lib/docker/overlay2/bc5fc2456c87054300bc3d0e2e619e17078de019849e1bf19fba1edcd66bc6af/merged
shm                       64M     0   64M   0% /var/lib/docker/containers/e66aa9db52490a4ec4f39809c4bbf9212ede0059307e21856160515970c29be5/mounts/shm
overlay                   50G   50G  159M 100% /var/lib/docker/overlay2/8f36525342c66b508369735032f3763712ef381da76a046173d718972b51fbdf/merged
overlay                   50G   50G  159M 100% /var/lib/docker/overlay2/73c0bdf479c40526cdd1ab9f85ea0355fb7986ea4514e6925a2a954216f28bf0/merged
shm                       64M     0   64M   0% /var/lib/docker/containers/cfe748305f892a932337df13af27b0662acc1aa2cfa112bea4b37fe3d3e16027/mounts/shm
overlay                   50G   50G  159M 100% /var/lib/docker/overlay2/8a45574efb09a4740a6ea31bf8a31acd0b49e7ab738934261ebaf61623ad98d0/merged
shm                       64M     0   64M   0% /var/lib/docker/containers/06c90561da84bc70c4fdb826a0f902ac3df0df19535a42f6f6052ddc92350a54/mounts/shm
shm                       64M     0   64M   0% /var/lib/docker/containers/30271ff7afc6c09a368dbf42b1567650013a1b56fba7991322187976296c738e/mounts/shm

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# 解决方式二（扩容）

CentOS 7 调整 home分区扩大 root分区

总体过程：把/home内容备份，然后将/home文件系统所在的逻辑卷删除，扩大/root文件系统，新建/home ，恢复/home内容

查看分区

df -h

备份home分区文件

tar cvf /tmp/home.tar/home

卸载/home，如果无法卸载，先终止使用/home文件系统的进程

fuser -km /home/

umount /home

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删除/home所在的lv

lvremove/dev/mapper/centos-home

扩展/root所在的lv，增加800G

lvextend -L +800G/dev/mapper/centos-root

扩展/root文件系统

xfs_growfs/dev/mapper/centos-root

重新创建home lv

lvcreate -L 73G -n/dev/mapper/centos-home

创建文件系统

mkfs.xfs  /dev/mapper/centos-home

挂载home

mount/dev/mapper/centos-home

home文件恢复

tar xvf /tmp/home.tar -C/home/

cd /home/home/

mv * ../

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