Time Required: 20 minutes
Next we need to configure the Linux kernel to support Oracle 12cR1.
Before we can install Oracle 12cR1 on our new VM, we need configure the Linux kernel. The following steps modify key settings to allow Oracle to execute.
Edit the /etc/sysctl.conf and add following lines:
# added for Oracle 12cR1 kernel.shmall = 2097152 kernel.shmmax = 3221225472 kernel.shmmni = 4096 kernel.sem = 250 32000 100 128 fs.file-max = 6815744 fs.aio-max-nr = 1048576 net.ipv4.ip_local_port_range = 9000 65500 net.core.rmem_default = 262144 net.core.rmem_max = 4194304 net.core.wmem_default = 262144 net.core.wmem_max = 1048576
The kernel.shmall and kernel.shmmax parameters are already set in the default install. Comment out the existing values so they do not conflict.
Now execute sysctl -p command to apply the new settings:
Note that the kernel.shmmax must be at least half of the physical RAM. If you set your VM RAM to 4GB, this figure would have to be typically set at 2147483648. If you use a figure slightly higher than 4096MB then the kernel.shmmax must be increased accordingly.
Edit the /etc/pam.d/login file and add following line:
# added for Oracle 12cR1 session required pam_limits.so
Edit the /etc/security/limits.conf file and add following lines:
# added for Oracle 12cR1 oracle soft nproc 2047 oracle hard nproc 16384 oracle soft nofile 1024 oracle hard nofile 65536 oracle soft stack 10240 oracle hard stack 10240
Unlike 11g, Oracle 12c is designed to work with SE Linux, so this feature does not need to be disabled.
Next we are going to disable the Linux firewall, which will otherwise interfere with the RAC install. First let’s make sure the firewall service is stopped:
[root@localhost ~]# service iptables stop Flushing firewall rules: [ OK ] Setting chains to policy ACCEPT: filter [ OK ] Unloading iptables modules: [ OK ]
To permanently disable the firewall we will disable the service:
[root@localhost ~]# chkconfig iptables off
Now we have the Linux kernel ready for Oracle.
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