I already wrote about migrating from CentOS 8 to Rocky Linux. Today, this quick post will list steps to convert existing VM or bare metal server from CentOS 8 to AlmaLinux 8.
WARNING! Make a backup before you start upgrading and the conversion procedure. I am an experienced Linux user, developer and sysadmin. However, there is no substitute for backups. Keep verified backups. Do not proceed further without backups. CyburDial is not responsible for data loss.
If you are doing this over an SSH session, I recommend running commands over GNU/screen or Tmux terminal multiplexer.
sudo -i
dnf update
reboot
wget https://raw.githubusercontent.com/AlmaLinux/almalinux-deploy/master/almalinux-deploy.sh
# read the script #
vim almalinux-deploy.sh
chmod -v +x almalinux-deploy.sh
./almalinux-deploy.sh
shutdown -r now
Connection to 3.1x.2xx.2xx closed by remote host.
cat /etc/redhat-release
## OR ##
cat /etc/os-release
ss -tulpn | more
ss -tulpn | grep ":80"
# Verify logs using the tail command and dmesg command+egrep command #
tail -f /var/log/httpd/app_name_goes_here
dmesg | egrep -i 'error|critical|warn'
This will convert your centos8 system over to AlmaLinux
cd /usr/src/dahdi-linux-complete-3.1.0+3.1.0/
make && make install
modprobe dahdi
dahdi_cfg -v (to check no errors)
I hope this helps
-Carpenox aka Chris
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