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Note : The document only focus on main steps or errors which can make you difficulty in installing or troubleshooting This demo using the environment in previous post. You can check here . 1. Get current information   [grid@saigon-01 ~]$ oifcfg getif enp0s3   192.168.56.0   global   public enp0s8   192.168.89.0   global   cluster_interconnect,asm   [grid@saigon-01 ~]$ srvctl config network Network 1 exists Subnet IPv4: 192.168.56.0/255.255.255.0/enp0s3, static Subnet IPv6: Ping Targets: Network is enabled Network is individually enabled on nodes: Network is individually disabled on nodes:   [grid@saigon-01 ~]$ srvctl config scan -all SCAN name: saigon-scan, Network: 1 Subnet IPv4: 192.168.56.0/255.255.255.0/enp0s3, static Subnet IPv6: SCAN 1 IPv4 VIP: 192.168.56.55 SCAN VIP is enabled. SCAN 2 IPv4 VIP: 192.168.56.66 SCAN VIP is enabled. SCAN 3 IPv4 VIP: 192.168.56.77 SCAN VIP is enabled.   [grid@saigon-01 ~]$ srvctl config scan_list...

Note : The document only focus on main steps or errors which can make you difficulty in installing or troubleshooting 1. Preparation 2. Install packages (on 2 nodes) # dnf -y install oracle-database-preinstall-21c # cd /etc/sysctl.d/ # ls -ltr … -rw-r--r--. 1 root root  449 Sep 16 12:26 99-initial-sysctl.conf -rw-r--r--. 1 root root 1966 Sep 16 12:26 99-oracle-database-preinstall-21c-sysctl.conf 3. Config /etc/hosts on 2 nodes   127.0.0.1    localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1          localhost localhost.localdomain localhost6 localhost6.localdomain6   192.168.56.11    saigon-01.south.com      saigon-01 192.168.56.22    saigon-02.south.com      saigon-02   192.168.56.33    saigon-01-vip.south.com      saigon-01-vip 192.168.56.44    saigon-02-vip.south.com  ...