1.首先看是谁占用了大的空间
[root@netops ~]# cd / [root@netops /]# du -sh * 0 bin 117M boot 0 dev 36M etc 12K home 0 lib 0 lib64 0 media 0 mnt 0 opt du: cannot access ‘proc/4086/task/4086/fd/4’: No such file or directory du: cannot access ‘proc/4086/task/4086/fdinfo/4’: No such file or directory du: cannot access ‘proc/4086/fd/4’: No such file or directory du: cannot access ‘proc/4086/fdinfo/4’: No such file or directory 0 proc 40K root 8.9M run 0 sbin 0 srv 0 sys 0 tmp 1.7G usr 29G var [root@netops /]# cd /var/ [root@netops var]# ls adm cache crash db empty games gopher kerberos lib local lock log mail nis opt preserve run spool tmp www yp [root@netops var]# du -sh *| grep G 29G lib [root@netops var]# cd lib/ [root@netops lib]# ls alternatives cs dbus games logrotate misc net-snmp os-prober plymouth postfix rpm-state stateless tpm vmware authconfig dav dhclient initramfs machines mysql NetworkManager php polkit-1 rpm rsyslog systemd tuned yum [root@netops lib]# du -sh * 28K alternatives 0 authconfig 0 cs 0 dav 0 dbus 0 dhclient 0 games 0 initramfs 4.0K logrotate 0 machines 0 misc 28G mysql 4.0K net-snmp 16K NetworkManager 0 os-prober 4.0K php 4.0K plymouth 0 polkit-1 4.0K postfix 77M rpm 0 rpm-state 4.0K rsyslog 0 stateless 64K systemd 0 tpm 0 tuned 0 vmware 5.5M yum [root@netops lib]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 50G 0 disk ├─sda1 8:1 0 2M 0 part ├─sda2 8:2 0 1G 0 part /boot └─sda3 8:3 0 40G 0 part ├─centos-root 253:0 0 30G 0 lvm / ├─centos-swap 253:1 0 2G 0 lvm [SWAP] └─centos-home 253:2 0 5G 0 lvm /home sdb 8:16 0 300G 0 disk sr0 11:0 1 1024M 0 rom [root@netops lib]# pvcreate /dev/sdb Physical volume "/dev/sdb" successfully created. [root@netops lib]# vgextend centos /dev/sdb Volume group "centos" successfully extended [root@netops lib]# vgs VG #PV #LV #SN Attr VSize VFree centos 2 3 0 wz--n- <340.00g <303.00g [root@netops lib]# lvextend -l +100%FREE -r /dev/centos/root Size of logical volume centos/root changed from 30.00 GiB (7680 extents) to <333.00 GiB (85247 extents). Logical volume centos/root successfully resized. meta-data=/dev/mapper/centos-root isize=512 agcount=4, agsize=1966080 blks = sectsz=512 attr=2, projid32bit=1 = crc=1 finobt=0 spinodes=0 data = bsize=4096 blocks=7864320, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 ftype=1 log =internal bsize=4096 blocks=3840, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 data blocks changed from 7864320 to 87292928 [root@netops lib]# [root@netops lib]# [root@netops lib]# df -h Filesystem Size Used Avail Use% Mounted on devtmpfs 3.9G 0 3.9G 0% /dev tmpfs 3.9G 0 3.9G 0% /dev/shm tmpfs 3.9G 8.9M 3.9G 1% /run tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup /dev/mapper/centos-root 333G 30G 303G 10% / /dev/sda2 1014M 149M 866M 15% /boot /dev/mapper/centos-home 5.0G 33M 5.0G 1% /home tmpfs 783M 0 783M 0% /run/user/0 [root@netops lib]# [root@netops lib]# [root@netops lib]# [root@netops lib]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 50G 0 disk ├─sda1 8:1 0 2M 0 part ├─sda2 8:2 0 1G 0 part /boot └─sda3 8:3 0 40G 0 part ├─centos-root 253:0 0 333G 0 lvm / ├─centos-swap 253:1 0 2G 0 lvm [SWAP] └─centos-home 253:2 0 5G 0 lvm /home sdb 8:16 0 300G 0 disk └─centos-root 253:0 0 333G 0 lvm / sr0 11:0 1 1024M 0 rom [root@netops lib]# df -h Filesystem Size Used Avail Use% Mounted on devtmpfs 3.9G 0 3.9G 0% /dev tmpfs 3.9G 0 3.9G 0% /dev/shm tmpfs 3.9G 8.9M 3.9G 1% /run tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup /dev/mapper/centos-root 333G 30G 303G 10% / /dev/sda2 1014M 149M 866M 15% /boot /dev/mapper/centos-home 5.0G 33M 5.0G 1% /home tmpfs 783M 0 783M 0% /run/user/0