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MongoDB日志切换(RotateLogFiles)实战

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Release: 2016-06-07 14:55:53
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MongoDB 日志切换(Rotate Log Files)实战 1. 在mongo shell下,执行logRotate命令: useadmindb.runCommand({logRotate:1}) 需要在mongos,mongod,config server运行。 该方式的变种: a) 在unix shell下运行: mongolocalhost/admin–eval“dbo.runComma

MongoDB 日志切换(Rotate Log Files)实战

 

1. 在mongo shell下,执行logRotate命令:    

use admin    
db.runCommand({logRotate:1})
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需要在mongos,mongod,config server运行。


该方式的变种:

a) 在unix shell下运行:

mongo localhost/admin –eval “dbo.runCommand({logRotate:1})”
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b) Bash脚本:
#!/bin/sh    
### log rotate    
mongo localhost/admin –evel “db.runCommand({logRotate:1})”    
### compress newly rotated    
for f in /var/log/mongodb/mongod.log.????-??-??T??-??-??;    
do    
7za a “$f.z” “$f”    
rm –f “$f”    
done
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c) 将如下脚本保存到logRotate.js文件:

db.getMongo().getDB(“admin”).runCommand({logRotate:1})
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创建脚本logRotate.sh:

#!/bin/sh    
# Clear old logs    
rm /var/log/mongodb/mongod.log.*    
# Rotate logs    
mongo logRotate.js
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d) logRotate.sh //写到计划任务crontab即可(需要expect软件包)

#!/usr/bin/expect –f    
spawn /usr/local/mongodb/bin/mongo admin -udev -ptest –quiet    
expect ">"    
send db.runCommand("logRotate")    
send "\r\n"    
expect ">"    
send "exit"
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2. 使用SIGUSR1信号:

kill –SIGUSR1 <mongod process id>    
find /var/log/mongodb/mongodb.log.* -mtime +7 –delete
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该方法的变种:

a) 用python写的定时脚本,每天产生一个新的log,超过7天的log自行删除。

#!/bin/env python
import sys
import os
import commands
import datetime,time
#get mongo pid
mongo_pid = commands.getoutput("/sbin/pidof mongod")
print mongo_pid
#send Sig to mongo
if mongo_pid != '':
cmd = "/bin/kill -USR1 %s" %(mongo_pid)
print cmd
mongo_rotate = commands.getoutput(cmd)
else:
print "mongod is not running..."
#clean log which > 7 days
str_now = time.strftime("%Y-%m-%d")
dat_now = time.strptime(str_now,"%Y-%m-%d")
array_dat_now = datetime.datetime(dat_now[0],dat_now[1],dat_now[2])
lns = commands.getoutput("/bin/ls --full-time /var/log/mongodb/|awk '{print $6, $9}'")
for ln in lns.split('\n'):
ws = ln.split()
if len(ws) != 2:
continue
ws1 = time.strptime(ws[0],"%Y-%m-%d")
ws2 = datetime.datetime(ws1[0],ws1[1],ws1[2])
if (array_dat_now - ws2).days > 7:
v_del = commands.getoutput("/bin/rm -rf /var/log/mongodb//%s" % (ws[1]))
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在root下crontab –e编辑定时任务

0 2 * * * /root/mongo_log_rotate.py >/root/null 2>&1
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3. 日志管理工具logrotate

自动化的最好方式是使用logrotate,其中copytruncate参数能更好工作。

拷贝以下代码到/etc/logrotate.d/mongodb文件中,确保脚本中的路径和文件名正确。

# vi /etc/logrotate.d/mongodb
/var/log/mongodb/*.log {
daily
rotate 7
compress
dateext
missingok
notifempty
sharedscripts
copytruncate
postrotate
/bin/kill -SIGUSR1 `cat /var/lib/mongo/mongod.lock 2> /dev/null` 2> /dev/null || true
endscript
}
# logrotate –f /etc/logrotate.d/mongodb
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4. Mongodb bug    
mongodb稳定性差强人意。在切换过程中也会导致mongodb进程终止。    
具体内容可以查看下mongodb bug系统:SERVER-4739、SERVER-3339。


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