Linux OL7/RHEL7: PRVE-0421 : No entry exists in /etc/fstab for mounting /dev/shm (文档 ID 2065603.1)

CentOS7和RHEL7在 /etc/fstab中不包含/dev/shm ，可以手动加进去，或者忽略都可以。

In this Document  

Symptoms

Changes

Cause

Solution

References

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APPLIES TO:

Oracle Database - Standard Edition - Version 12.1.0.2 and later  
Oracle Database - Enterprise Edition - Version 12.2.0.1 to 12.2.0.1 [Release 12.2]  
Generic Linux  

SYMPTOMS

Installing Grid infrastructure  12.1.0.2 on OL 7.1,cluvfy pre crsinst stage fails checking /dev/shm on both nodes.

PRVE-0421 : No entry exists in /etc/fstab for mounting /dev/shm
PRVE-0421 : No entry exists in /etc/fstab for mounting /dev/shm

CHANGES

 

CAUSE

This is due to below bugs:

OL7 -  BUG   21441387  - 12.2/MAIN/OL7.1: CVU REPORTS /DEV/SHM NOT MOUNTED WHEN IT IS MOUNTED

RHEL 7 - Bug   25907259   : RHEL7.2: CVU REPORTS /DEV/SHM NOT MOUNTED WHEN IT IS MOUNTED

SOLUTION

 This issue is fixed in 12.2.0.2, request for one-off patch if necessary.

As a work-around in OL7:

In OL7, the /dev/shm is not mounted in /etc/fstab on a fresh system, it is done in:

[root@testc140 u02]# ll /usr/lib/dracut/modules.d/99base/init.sh
-rwxr-xr-x. 1 root root 11379 Mar 26 10:14
vi /usr/lib/dracut/modules.d/99base/init.sh and comment the below lines

62 if ! ismounted /dev/shm; then
63 mkdir -m 0755 /dev/shm
64 mount -t tmpfs -o mode=1777,nosuid,nodev,strictatime tmpfs /dev/shm >/dev/null
65 fi

so, this validation is not really valid for OL7.