Articles for Linux
How to public any service without public ip using OPENVPN.
Some time we want to publish our website or any service from our desktop to internet . Then we require public IP to publish our services on the internet.
So resolve this issue we can user third party services like PORTMAP.IO this gives you ability to publish your services over the internet using OPEN VPN Client.
For more information visit there website https://portmap.io/
How to configure SSL VPN on OPENVPN
If you want to configure openvpn on SSL port below are the example for server and client side.
Server side configuration
local 192.168.1.250 port 443 proto tcp dev tun ca ca.crt cert server.crt key server.key dh dh.pem auth SHA512 tls-crypt tc.key topology subnet server 10.8.0.0 255.255.255.0 #server-ipv6 fddd:1194:1194:1194::/64 #push "redirect-gateway def1 ipv6 bypass-dhcp" ## To avoid all internet traffic except VPN## push "route 192.168.29.0 255.255.255.0" ## To advertise Network ## ifconfig-pool-persist ipp.txt push "dhcp-option DNS 192.168.29.254" #push "dhcp-option DNS 8.8.4.4" keepalive 10 120 cipher AES-256-CBC user nobody duplicate-cn ##To use single certificate for multiple user# group nobody persist-key persist-tun verb 3 crl-verify crl.pem
How to setup your IT Infrastructure for Work From Home in low cost with open source secure industry standard technologies.
Here I am going to talk about talk about small and medium size offices and companies who are not able to invest big amount to upgrade or migrate there IT infrastructure for there workers to work from home in the COVID pandemic .
There are few things mostly you are using in the office as IT infrastructure as end user. if that IT infrastructure is available at your home then mostly people can work from home easily.
I am taking a small office example scenario with 30 employees which you require to work from home.
Simple small office network diagram .
Continue reading How to setup your IT Infrastructure for Work From Home
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 $(ls *.repo); do mv $i $i.orig; done
copy the below code and save as CentOS-Base.repo
# CentOS-Base.repo # # The mirror system uses the connecting IP address of the client and the # update status of each mirror to pick mirrors that are updated to and # geographically close to the client. You should use this for CentOS updates # unless you are manually picking other mirrors. # # If the mirrorlist= does not work for you, as a fall back you can try the # remarked out baseurl= line instead. # # [base] name=CentOS-$releasever - Base #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os baseurl=http://vault.centos.org/5.11/os/$basearch gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5 #released updates [updates] name=CentOS-$releasever - Updates #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates baseurl=http://vault.centos.org/5.11/updates/$basearch gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5 #packages used/produced in the build but not released [addons] name=CentOS-$releasever - Addons #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=addons baseurl=http://vault.centos.org/5.11/addons/$basearch gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5 #additional packages that may be useful [extras] name=CentOS-$releasever - Extras #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=extras baseurl=http://vault.centos.org/5.11/extras/$basearch gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5 #additional packages that extend functionality of existing packages [centosplus] name=CentOS-$releasever - Plus #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=centosplus baseurl=http://vault.centos.org/5.11/centosplus/$basearch gpgcheck=1 enabled=0 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5 #contrib - packages by Centos Users [contrib] name=CentOS-$releasever - Contrib #mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=contrib baseurl=http://vault.centos.org/5.11/contrib/$basearch gpgcheck=1 enabled=0 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5
How to check Internet Speed on Centos CLI
Speedtest-cli is Python script its works on Python program.
you must have Python installed. check if have installed .
python –version
python3 –version
lsb_release -a
if you have not install then install it by
# yum install python
Download the script
#wget -O speedtest-cli https://raw.githubusercontent.com/sivel/speedtest-cli/master/speedtest.py
#chmod +x speedtest-cli
Now check the internet speed
#./speedtest-cli
or
#python speedtest-cli
Centos 6.4 repository not working
just rename /etc/yum.repos.d/CentOS-Base.repo
cd /etc/yum.repos.d/
mv CentOS-Base.repo CentOS-Base.repo.old
copy and paste below code on command prompt
they try to use yum .
cat <<-'EOF' > /etc/yum.repos.d/CentOS-Base.repo [C6.4-base] name=CentOS-6.4 - Base baseurl=http://vault.centos.org/6.4/os/$basearch/ gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6 enabled=1 metadata_expire=never [C6.4-updates] name=CentOS-6.4 - Updates baseurl=http://vault.centos.org/6.4/updates/$basearch/ gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6 enabled=1 metadata_expire=never [C6.4-extras] name=CentOS-6.4 - Extras baseurl=http://vault.centos.org/6.4/extras/$basearch/ gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6 enabled=1 metadata_expire=never [C6.4-contrib] name=CentOS-6.4 - Contrib baseurl=http://vault.centos.org/6.4/contrib/$basearch/ gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6 enabled=0 metadata_expire=never [C6.4-centosplus] name=CentOS-6.4 - CentOSPlus baseurl=http://vault.centos.org/6.4/centosplus/$basearch/ gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6 enabled=0 metadata_expire=never EOF
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
# 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
DU command uses for disk uses you can use du command to check directory size. for example you want to check directory size of a folder "database" use -h for size in MB GB etc # du -h ./database/ 17G ./database/
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
Continue reading How to update Centos 5 .X and cannot find a valid baseurl for repo