Centos7 Jenkins日志过大

df 查看 占用

[root@instance-ncwnnt0e /]# df
Filesystem     1K-blocks     Used Available Use% Mounted on
devtmpfs         1008756        0   1008756   0% /dev
tmpfs            1020532        0   1020532   0% /dev/shm
tmpfs            1020532    17048   1003484   2% /run
tmpfs            1020532        0   1020532   0% /sys/fs/cgroup
/dev/vda1       41152716 23703492  15702820  61% /
overlay         41152716 23703492  15702820  61% /var/lib/docker/overlay2/c9b8caf06e0ad30a31f6c07f9613fdedab8a421062ece6742c0b2be82c9fc8a4/merged
shm                65536        8     65528   1% /var/lib/docker/containers/4f10f72d7aeab949f61af6bd79567b33898482ffbbb6dd2df2a98d0177f3bc88/mounts/shm
overlay         41152716 23703492  15702820  61% /var/lib/docker/overlay2/4e9cf0a90f69dbe5d852fd8a11538ffc0eca2bcfc44b219a6c59d7a86d66bd2a/merged
shm                65536        0     65536   0% /var/lib/docker/containers/f3e20483118e8dc248a5c11b60974959e0049a02898c8e17b3fd38590cfb27eb/mounts/shm
overlay         41152716 23703492  15702820  61% /var/lib/docker/overlay2/e4ce1e7a67fdb15a01f49b4331edcdd5fbbfcd853903b82bf58bf4aafcbe2ffb/merged
shm                65536       64     65472   1% /var/lib/docker/containers/53914bcee1c41fbf162e079a5037955101dd8d0e5cc90e3d98fc50a15ad1aa7d/mounts/shm
tmpfs             204108        0    204108   0% /run/user/0

[root@instance-ncwnnt0e lib]# cd /
[root@instance-ncwnnt0e /]# sudo du -ah --max-depth=1 
4.2M	./tmp
0	./bin
3.5G	./usr
0	./sys
139M	./root
0	./sbin
0	./lib
0	./lib64
4.0K	./home
150M	./opt
du: cannot access ‘./proc/17755/task/17755/fd/4’: No such file or directory
du: cannot access ‘./proc/17755/task/17755/fdinfo/4’: No such file or directory
du: cannot access ‘./proc/17755/fd/3’: No such file or directory
du: cannot access ‘./proc/17755/fdinfo/3’: No such file or directory
0	./proc
16K	./lost+found
4.0K	./mnt
4.0K	./srv
0	./.autorelabel
226M	./boot
39M	./etc
20G	./var
4.0K	./flag_ok
4.0K	./media
0	./dev
17M	./run
24G	.

继续 sudo du -ah --max-depth=1

[root@instance-ncwnnt0e /]# cd var 
[root@instance-ncwnnt0e var]# ls
account  adm  cache  crash  db  empty  games  gopher  kerberos  lib  local  lock  log  mail  nis  opt  preserve  run  spool  tmp  yp
[root@instance-ncwnnt0e var]# sudo du -ah --max-depth=1 
20K	./tmp
4.0K	./crash
4.0K	./.updated
203M	./cache
0	./lock
20K	./db
4.0K	./nis
3.9G	./lib
4.0K	./local
0	./mail
4.0K	./opt
16G	./log
4.0K	./games
4.0K	./adm
120K	./spool
4.0K	./preserve
4.0K	./account
12K	./kerberos
8.0K	./empty
4.0K	./gopher
4.0K	./yp
0	./run
20G	.
[root@instance-ncwnnt0e var]# 

Jenkins 日志使用 16G

[root@instance-ncwnnt0e log]# sudo du -ah --max-depth=1 
716K	./messages
4.2M	./sa
5.8M	./audit
0	./boot.log
32K	./boot.log-20190415
716K	./btmp
28K	./yum.log
4.0K	./qemu-ga
12K	./cloud-init-output.log
32K	./dmesg.old
4.0K	./grubby_prune_debug
0	./spooler
36K	./wtmp
280K	./cloud-init.log
4.0K	./grubby
16G	./jenkins
4.0K	./anaconda
4.0K	./maillog
1.1M	./secure
4.0K	./chrony
32K	./dmesg
4.0K	./rhsm
16K	./tuned
12K	./lastlog
112K	./cron
28K	./boot.log-20190417
16G	.

原因：

因为DNS查询错误，返回了所有的日志数据，解决方法：
【系统管理】=》【system log】=>【日志级别】=》【Name: javax.jmdns,Level: off】

[root@instance-ncwnnt0e log]# cd jenkins 
[root@instance-ncwnnt0e jenkins]# ls
jenkins.log
[root@instance-ncwnnt0e jenkins]# sudo rm jenkins.log