MongoDB log switching (RotateLogFiles) Practice

MongoDB log switching (RotateLogFiles) Practice 1. In mongoshell, run the logRotate command: useadmindb. runCommand ({logRotate: 1}) and run it on mongos, mongod, and configserver. A) Run: mongolocalhostadmin-eval "dbo. runComma" in unixshell.

MongoDB Log Files (Rotate Log Files) Practice 1. In mongo shell, run the logRotate command: useadmindb. runCommand ({logRotate: 1}) and run it on mongos, mongod, and config server. A) run the mongolocalhost/admin-eval "dbo. runComma" command in the unix shell.

MongoDB Log switching (Rotate Log Files) Practice

1. Run the logRotate command in mongo shell:

use admin    db.runCommand({logRotate:1})

It must be run on mongos, mongod, and config server.

Variants of this method:

A) run in unix shell:

mongo localhost/admin –eval “dbo.runCommand({logRotate:1})”

B) Bash script:

#!/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

C) Save the following script to the logRotate. js file:

db.getMongo().getDB(“admin”).runCommand({logRotate:1})

Create the script logRotate. sh:

#!/bin/sh    # Clear old logs    rm /var/log/mongodb/mongod.log.*    # Rotate logs    mongo logRotate.js

D) logRotate. sh // write it to the crontab of the scheduled task (the audit CT package is required)

#!/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"

2. Use the SIGUSR1 signal:

kill –SIGUSR1 
 
      find /var/log/mongodb/mongodb.log.* -mtime +7 –delete
 

Variants of this method:

A) Use a scheduled script written in python to generate a new log every day and delete the logs that have been written for more than 7 days.

#!/bin/env pythonimport sysimport osimport commandsimport datetime,time#get mongo pidmongo_pid = commands.getoutput("/sbin/pidof mongod")print mongo_pid#send Sig to mongoif mongo_pid != '':cmd = "/bin/kill -USR1 %s" %(mongo_pid)print cmdmongo_rotate = commands.getoutput(cmd)else:print "mongod is not running..."#clean log which > 7 daysstr_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:continuews1 = 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]))

Edit the scheduled task in crontab-e under root.

0 2 * * * /root/mongo_log_rotate.py >/root/null 2>&1

3. logrotate

The best way to automate is to use logrotate, where the copytruncate parameter can work better.

Copy the following code to the/etc/logrotate. d/mongodb file to ensure that the path and file name in the script are correct.

# vi /etc/logrotate.d/mongodb/var/log/mongodb/*.log {dailyrotate 7compressdateextmissingoknotifemptysharedscriptscopytruncatepostrotate/bin/kill -SIGUSR1 `cat /var/lib/mongo/mongod.lock 2> /dev/null` 2> /dev/null || trueendscript}# logrotate –f /etc/logrotate.d/mongodb

4. Mongodb bug
Mongodb stability is unsatisfactory. The mongodb process will also be terminated during the switchover.
For details, see mongodb bug Systems: SERVER-4739 and SERVER-3339.