Install19cOracleRedhat8

1. Sudo dba

   $ su -
   # echo -e "dba\tALL=(ALL)\tNOPASSWD: ALL" > /etc/sudoers.d/020_sudo_dba
   
   # cat /etc/sudoers.d/020_sudo_dba
   your_id ALL=(ALL) NOPASSWD: ALL

2. Remove graphic interface

   $ sudo dnf groupinstall -y "Minimal Install"
   $ sudo dnf groupremove -y "Server with GUI"
   $ sudo dnf groupinstall -y "Server"
   
   # minimal graphic
   	
   sudo subscription-manager repos --enable=codeready-builder-for-rhel-8-x86_64-rpms
   sudo yum install  xorg-x11-server-Xorg xorg-x11-xauth xorg-x11-apps -y

3. X11 forwarding

   #check setting in /etc/ssh/sshd_config
   
   AllowTcpForwarding     yes
   X11UseLocalhost        yes
   X11DisplayOffset       10
   X11Forwarding          yes

4. install SAR

   	sudo yum install sysstat
   	sudo systemctl enable sysstat
   	sudo systemctl start sysstat

5. Snmp /etc/snmp/snmpd.conf
6. Users and Groups

   #basic groups for database management or check 
   ```
   getent group | grep oinstall
   54321 => ok 
   getent group | grep dba
   54322 => ok 
   getent group | grep oper
   54323 => ok 
   getent group | grep dgdba
   => missing  ko
   getent group | grep kmdba
   => missing  ko
   getent group | grep backupdba
   => missing  ko
   
   # if missing we need to add 
   
   groupadd -g 54321 oinstall
   groupadd -g 54322 dba
   groupadd -g 54323 oper
   sudo sudo groupadd -g 65539 dgdba
   sudo sudo groupadd -g 65540 kmdba
   sudo sudo groupadd -g 65538 backupdba
   
   > the oper have the same guid than monitor
   
   sudo useradd -u 54321 -g oinstall -G dba,oper,backupdba,dgdba,kmdba oracle
   
   #sudo usermod -u 54321 -G oinstall,dba,oper,backupdba,dgdba,kmdba,racdba  oracle

7. - add keyssh  dba
8. monitoring centreon
9. basic packages to install

   um install -y bc 
   yum install -y binutils 
   # yum install -y compat-libcap1  #not exist redhat8
   # yum install -y compat-libstdc++-33 #not exist redhat8
   yum install -y elfutils-libelf 
   yum install -y elfutils-libelf-devel 
   yum install -y fontconfig-devel 
   yum install -y glibc 
   yum install -y glibc-devel 
   yum install -y ksh 
   yum install -y libaio 
   yum install -y libaio-devel 
   # yum install -y libdtrace-ctf-devel  not exist redhat8 
   yum install -y libXrender 
   yum install -y libXrender-devel 
   yum install -y libX11 
   yum install -y libXau 
   yum install -y libXi 
   yum install -y libXtst 
   yum install -y libgcc 
   yum install -y librdmacm-devel 
   yum install -y libstdc++ 
   yum install -y libstdc++-devel 
   yum install -y libxcb 
   yum install -y make 
   yum install -y smartmontools 
   yum install -y sysstat
   
   # https://anuragkumarjoy.blogspot.com/2020/04/oracle-19c-installation-on-linux-8.html
   ## /u2/oracle/install/perl/bin/perl: error while loading shared libraries: libnsl.so.1: cannot open shared object file: No such file or directory
   dnf install -y libnsl
   dnf install -y libnsl.i686
   dnf install -y libnsl2
   dnf install -y libnsl2.i686
   
   
   dnf install -y gcc
   yum install -y net-tools