Linux Archives - Gkhan Tips

centos 5.11 yum repository

Post author:Gkhan
Post published:April 2, 2021
Post category:Linux
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centos 5.11 yum repository It is now EOD no updates available. but we require yum repo to install old applications . go to and run cd /etc/yum.repos.d for i in…

How to check Internet Speed on Centos CLI

Post author:Gkhan
Post published:March 5, 2021
Post category:Linux
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How to check Internet Speed on Centos CLI Speedtest-cli is Python script its works on Python program. you must have Python installed. check if have installed . python --version python3…

Centos 6.x repository not working

Post author:Gkhan
Post published:February 25, 2021
Post category:Linux
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Centos 6.4 repository not working just rename /etc/yum.repos.d/CentOS-Base.repo cd /etc/yum.repos.d/ mv CentOS-Base.repo CentOS-Base.repo.old copy and paste below code on command prompt they try to use yum . cat <<-'EOF'…

Centos 7 Setup command not found

Post author:Gkhan
Post published:January 25, 2021
Post category:Linux
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yum install setuptool -y yum install system-config-network* -y yum install system-config-firewall* -y yum install system-config-securitylevel-tui -y yum install system-config-keyboard -y yum install ntsysv -y yum install NetworkManager-tui nmtui

How to Install VMware Tools on CentOS 7

Post author:Gkhan
Post published:October 28, 2018
Post category:Linux VMware
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How to Install VMware Tools on CentOS 7 # yum install -y open-vm-tools check file is exist # ls /usr/bin/vmtoolsd Now reboot the server

How to check directory size in Linux

Post author:Gkhan
Post published:October 25, 2018
Post category:Linux
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How to check directory size in Linux DU command uses for disk uses you can use du command to check directory size. for example you want to check directory size…

How to update Centos 5 .X and cannot find a valid baseurl for repo

Post author:Gkhan
Post published:August 27, 2018
Post category:Linux
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How to update Centos 5 .X and cannot find a valid baseurl for repo

If you are using CentOS 5.x and want to install any software and update CentOS 5.x . you are getting following error .

root@server1 [~]# yum update -y
Loaded plugins: fastestmirror
Determining fastest mirrors
YumRepo Error: All mirror URLs are not using ftp, http[s] or file.
 Eg. Invalid release/
removing mirrorlist with no valid mirrors: /var/cache/yum/base/mirrorlist.txt
Error: Cannot find a valid baseurl for repo: base

This is because update repositories were moved to the CentOS vault when the operating reached it's end-of-life.

Edit the following file

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OpenVPN CRL has expired

Post author:Gkhan
Post published:July 15, 2018
Post category:Linux VPN
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OpenVPN CRL has expired VERIFY ERROR: depth=0, error=CRL has expired: CN=servername In order to fix the issue, we just need to recreate the crl.pem file. we need to backup the current crl.pem…

OPENVPN Logs

Post author:Gkhan
Post published:July 15, 2018
Post category:Linux VPN
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OPENVPN Logs To troubleshoot connection issues check below logs grep the client name in /var/log/messages # grep VPN /var/log/messages Check the connection time #cat /etc/openvpn/openvpn-status.log Check the connection negotiation…

SSH Login Email Alerts

Post author:Gkhan
Post published:December 7, 2017
Post category:Linux
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SSH Login Email Alerts The examples below send an email when someone logs into your server. For this to work, your server must be able to send mail using the mail command.…