Configuring the Deployment Environment

This section uses three servers and three clients as an example.

1. Set the host name on each node.

   hostnamectl set-hostname ceph1
   hostnamectl set-hostname ceph2
   hostnamectl set-hostname ceph3
   hostnamectl set-hostname client1
   hostnamectl set-hostname client2
   hostnamectl set-hostname client3

2. Configure the host names on the three hosts and add the following content to the /etc/hosts file:

   [IP] ceph1
   [IP] ceph2
   [IP] ceph3
   [IP] client1
   [IP] client2
   [IP] client3

   

   Change [IP] to the actual local IP address.

3. Configure password-free login on ceph1, ceph2, and ceph3.

   ssh-keygen -t rsa 
   for i in {1..3};do ssh-copy-id ceph$i;done

4. Disable the firewall.

   systemctl stop firewalld
   systemctl disable firewalld
   systemctl status firewalld

5. Disable SELinux.

   setenforce 0
   sed -i 's/=permissive/=disabled/g' /etc/selinux/config

6. Configure clock synchronization on ceph1, ceph2, and ceph3.
   1. Install the chrony service.

      dnf install -y chrony

   2. Back up the configuration file.

      mv /etc/chrony.conf /etc/chrony.conf.bak

   3. Modify the configuration file.

      cat > /etc/chrony.conf <<EOF
      server xxx iburst # xxx indicates the IP address of the synchronization service.
      allow xxx/xx # xxx indicates the local IP address.
      local stratum 10
      EOF

   4. Restart chrony.

      systemctl restart chronyd
      systemctl enable chronyd

   5. Check the time synchronization status.

      chronyc -a makestep  # Forcibly synchronize the system time.
      chronyc sourcestats   # Display the synchronization statistics of the current time source.
      chronyc sources -v    # Display detailed information about the current time source.