September 2016 - VPSHELPDESK.COM

#ls -la /etc/squid drwxr-xr-x 2 root root 4096 Sep 4 00:15 . drwxr-xr-x 53 root root 4096 Sep 4 00:36 .. -rw-r--r-- 1 root squid 419 Aug 4 07:56 cachemgr.conf -rw-r--r-- 1 root root 419 Aug 4 07:56 cachemgr.conf.default -rw-r--r-- 1 root root 1547 Aug 4 07:56 errorpage.css -rw-r--r-- 1 root root 1547 Aug 4 07:56 errorpage.css.default -rw-r--r-- 1 root root 11651 Aug 4 07:56 mime.conf -rw-r--r-- 1 root root 11651 Aug 4 07:56 mime.conf.default -rw-r--r-- 1 root root 421 Aug 4 07:56 msntauth.conf -rw-r--r-- 1 root root 421 Aug 4 07:56 msntauth.conf.default -rw-r----- 1 root squid 3948 Sep 4 00:14 squid.conf -rw-r--r-- 1 root root 2425 Aug 4 07:56 squid.conf.default

forwarded_for off request_header_access Allow allow all request_header_access Authorization allow all request_header_access WWW-Authenticate allow all request_header_access Proxy-Authorization allow all request_header_access Proxy-Authenticate allow all request_header_access Cache-Control allow all request_header_access Content-Encoding allow all request_header_access Content-Length allow all request_header_access Content-Type allow all request_header_access Date allow all request_header_access Expires allow all request_header_access Host allow all request_header_access If-Modified-Since allow all request_header_access Last-Modified allow all request_header_access Location allow all request_header_access Pragma allow all request_header_access Accept allow all request_header_access Accept-Charset allow all request_header_access Accept-Encoding allow all request_header_access Accept-Language allow all request_header_access Content-Language allow all request_header_access Mime-Version allow all request_header_access Retry-After allow all request_header_access Title allow all request_header_access Connection allow all request_header_access Proxy-Connection allow all request_header_access User-Agent allow all request_header_access Cookie allow all request_header_access All deny all

VPS Server with little memory is it very important to set up crontab job to automatically restart VPS Server on low memory based on condition. Check how much memory is left on the VPS Server, if 100M memory left then reboot the VPS Server.

Write bash script to checks how much memory is left and reboot the VPS.

#vim restartmemorylow

Below is script for CentOS, for Debian 7/8 find at bottom of this page

#!/bin/bash
mem=$(free -m | awk '/Mem:/{print $4}')
(( mem <= 100 )) && /sbin/shutdown -r now

We also can Swap memory, if less than 100M then reboot VPS Server

#vim restartswapmemorylow

#!/bin/bash
swapmem=$(free -m | awk '/Swap:/{print $4}')
(( swapmem <= 100 )) && /sbin/shutdown -r now

Make the script executable

#chmod +x restartmemorylow
#chmod +x restartswapmemorylow

Add script to the to crontab (make sure path/to/the/script correct)

crontab -u root -e

Check memory low every week At 01:00 on Sunday (https://crontab.guru)

0 1 * * 0 /restartmemorylow
0 1 * * 0 /restartswapmemorylow

Error occurred and how to solved

Check error by check current mail with following command

tail -f /var/spool/mail/root

If crontab command not found, Install cron with following command

#crontab -u root -e
-bash: crontab: command not found
#yum install vixie-cron crontabs
#chkconfig crond on
#service crond start
#chkconfig --list | grep crond

Low memory script and install cron on Debian 7 / 8

#vim restartmemorylow

#!/bin/bash
mem=$(cat /proc/meminfo | egrep "^MemFree" |awk '{print $2}')
if (( mem <= 51200 )); then
echo "Memory lower than or 10%, so we kill and restart";
/sbin/shutdown -r now
else
echo "Memory is fine"
fi

Make the script executable

#chmod +x restartmemorylow

#apt-get install cron

For all cron jobs that should be executed under a user’s account, you should use crontab -e. For system jobs, you should add a file under /etc/cron.d, if that exists; under /etc/cron.{hourly|daily|weekly|monthly} (but those must not be named like a package name!), if that fits your purpose; or add a line to /etc/crontab. But be aware that /etc/crontab might be overwritten with a system update.

Insert

#crontab -u root -e
0 1 * * 0 root /restartmemorylow

Enable cron log on Debian

#vim /etc/rsyslog.conf

In the file, you will find the following line: #cron.* -/var/log/cron
Uncomment the line (remove the #) and save the rsyslog.conf file

cron.* -/var/log/cron

#service rsyslog restart

After restarting the rsyslog daemon, crontab log entries will appear in the /var/log/cron.log file.

Month: September 2016

Install Setup Squid HTTP Web Proxy CentOS 6 Server

Crontab job auto restart server on memory low CentOS 6 server