By Franck Pachot

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The Linux prerequisites for Oracle Database are all documented but using the pre-install rpm makes all things easier. Before 18c, this was easy on Oracle Enterprise Linux (OEL) but not so easy on RedHat (RHEL) where the .rpm had many dependencies on OEL and UEK.
Now that 18c is there to download, there’s also the 18c preinstall rpm and the good news is that it can be run also on RHEL without modification.

This came to my attention on Twitter:

And of course this is fully documented:
https://docs.oracle.com/en/database/oracle/oracle-database/18/cwlin/about-the-oracle-preinstallation-rpm.html#GUID-C15A642B-534D-4E4A-BDE8-6DC7772AA9C8

In order to test it I’ve created quickly a CentOS instance on the Oracle Cloud:
CaptureCentosPreinstall

I’ve downloaded the RPM from the OEL7 repository:


[root@instance-20180803-1152 opc]# curl -o oracle-database-preinstall-18c-1.0-1.el7.x86_64.rpm https                                                                    ://yum.oracle.com/repo/OracleLinux/OL7/latest/x86_64/getPackage/oracle-database-preinstall-18c-1.0-1                                                                    .el7.x86_64.rpm
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 18244  100 18244    0     0  63849      0 --:--:-- --:--:-- --:--:-- 63790

then ran the installation:


[root@instance-20180803-1152 opc]# yum -y localinstall oracle-database-preinstall-18c-1.0-1.el7.x86_ 64.rpm

 
It installs automatically all dependencies:

Installed:
  oracle-database-preinstall-18c.x86_64 0:1.0-1.el7
 
Dependency Installed:
  compat-libcap1.x86_64 0:1.10-7.el7      compat-libstdc++-33.x86_64 0:3.2.3-72.el7   glibc-devel.x86_64 0:2.17-222.el7     glibc-headers.x86_64 0:2.17-222.el7
  gssproxy.x86_64 0:0.7.0-17.el7          kernel-headers.x86_64 0:3.10.0-862.9.1.el7  keyutils.x86_64 0:1.5.8-3.el7         ksh.x86_64 0:20120801-137.el7
  libICE.x86_64 0:1.0.9-9.el7             libSM.x86_64 0:1.2.2-2.el7                  libXext.x86_64 0:1.3.3-3.el7          libXi.x86_64 0:1.7.9-1.el7
  libXinerama.x86_64 0:1.1.3-2.1.el7      libXmu.x86_64 0:1.1.2-2.el7                 libXrandr.x86_64 0:1.5.1-2.el7        libXrender.x86_64 0:0.9.10-1.el7
  libXt.x86_64 0:1.1.5-3.el7              libXtst.x86_64 0:1.2.3-1.el7                libXv.x86_64 0:1.0.11-1.el7           libXxf86dga.x86_64 0:1.1.4-2.1.el7
  libXxf86misc.x86_64 0:1.0.3-7.1.el7     libXxf86vm.x86_64 0:1.1.4-1.el7             libaio-devel.x86_64 0:0.3.109-13.el7  libbasicobjects.x86_64 0:0.1.1-29.el7
  libcollection.x86_64 0:0.7.0-29.el7     libdmx.x86_64 0:1.1.3-3.el7                 libevent.x86_64 0:2.0.21-4.el7        libini_config.x86_64 0:1.3.1-29.el7
  libnfsidmap.x86_64 0:0.25-19.el7        libpath_utils.x86_64 0:0.2.1-29.el7         libref_array.x86_64 0:0.1.5-29.el7    libstdc++-devel.x86_64 0:4.8.5-28.el7_5.1
  libverto-libevent.x86_64 0:0.2.5-4.el7  nfs-utils.x86_64 1:1.3.0-0.54.el7           psmisc.x86_64 0:22.20-15.el7          xorg-x11-utils.x86_64 0:7.5-22.el7
  xorg-x11-xauth.x86_64 1:1.0.9-1.el7

Note that the limits are stored in limits.d which has priority over limits.conf:


[root@instance-20180803-1152 opc]# cat /etc/security/limits.d/oracle-database-preinstall-18c.conf
 
# oracle-database-preinstall-18c setting for nofile soft limit is 1024
oracle   soft   nofile    1024
 
# oracle-database-preinstall-18c setting for nofile hard limit is 65536
oracle   hard   nofile    65536
 
# oracle-database-preinstall-18c setting for nproc soft limit is 16384
# refer orabug15971421 for more info.
oracle   soft   nproc    16384
 
# oracle-database-preinstall-18c setting for nproc hard limit is 16384
oracle   hard   nproc    16384
 
# oracle-database-preinstall-18c setting for stack soft limit is 10240KB
oracle   soft   stack    10240
 
# oracle-database-preinstall-18c setting for stack hard limit is 32768KB
oracle   hard   stack    32768
 
# oracle-database-preinstall-18c setting for memlock hard limit is maximum of 128GB on x86_64 or 3GB on x86 OR 90 % of RAM
oracle   hard   memlock    134217728
 
# oracle-database-preinstall-18c setting for memlock soft limit is maximum of 128GB on x86_64 or 3GB on x86 OR 90% of RAM
oracle   soft   memlock    134217728

Note that memlock is set to 128GB here but can be higher on machines with huge RAM (up to 90% of RAM)

And for information, here is what is set in /etc/sysctl.conf:


fs.file-max = 6815744
kernel.sem = 250 32000 100 128
kernel.shmmni = 4096
kernel.shmall = 1073741824
kernel.shmmax = 4398046511104
kernel.panic_on_oops = 1
net.core.rmem_default = 262144
net.core.rmem_max = 4194304
net.core.wmem_default = 262144
net.core.wmem_max = 1048576
net.ipv4.conf.all.rp_filter = 2
net.ipv4.conf.default.rp_filter = 2
fs.aio-max-nr = 1048576
net.ipv4.ip_local_port_range = 9000 65500

Besides that, the preinstall rpm disables NUMA and transparent huge pages (as boot options in GRUB). It creates the oracle user (id 54321 and belonging to groups oinstall,dba,oper,backupdba,dgdba,kmdba,racdba)

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