Sudo privilege requirements for Oracle environments

This topic describes the rationale behind specific sudo privilege requirements for virtualizing Oracle Databases.

Privilege

Sources

Targets

Rationale

ps | pargs

Optional, Strongly Recommended

Delphix auto-discovery uses the TNS_ADMIN environment variable of Oracle Listener processes with non-standard configurations to derive their connection parameters. A different user (oracle), rather than delphix_os user normally owns the oracle listener. The Delphix Engine needs sudo access to pargs on the Solaris OS or ps on other OSes to determine the environment variables of those Listener processes.

This privilege is required for Auto-Discovery with non-default TNS_ADMIN locations. It is optional when using a standard TNS_ADMIN location, or if you choose to manually configure Oracle Homes, databases and listeners.

mount/umount

Not Required

Required

The Delphix Engine dynamically mounts and unmounts directories under the provisioning directory during VDB operations. This privilege is required because mount and umount are typically reserved for superuser.

nfso (AIX only)

Not Required

Required

The Delphix Engine monitors NFS read and write sizes on an AIX target host. It uses the nfso command to query the sizes in order to optimize NFS performance for VDBs running on the target host. Only a superuser can issue the nfso command.

It is required to specify the NOPASSWD qualifier within the "sudo" configuration file, as shown here: Sudo File Configuration Examples for Oracle Environments. This ensures that the "sudo" command does not demand the entry of a password, even for the "display permissions" (i.e. "sudo -l") command.

Delphix issues "sudo -l" in some scripts to detect if the operating system user has the correct sudo privileges. If it is unable to execute this command, some actions may fail and Delphix will raise an alert suggesting it does not have the correct sudo permissions. Restricting the execution of "sudo -l" by setting “listpw=always” in the “/etc/sudoers” file when the Delphix operating system user is configured to use public key authentication will cause the Delphix operating system user to be prompted for a password which will fail certain Delphix actions. Use a less restrictive setting for listpw than "always" when the Delphix operating system user is using public-key authentication.

Oracle mount options for RAC
AIX	CODE `cio,rw,bg,hard,nointr,timeo=600,proto=tcp,nosuid,noac`
HPUX	CODE `rw,bg,hard,rsize=1048576,wsize=1048576,nointr,timeo=600,proto=tcp,nosuid,forcedirectio,noac`
Solaris	CODE `rrw,bg,hard,rsize=1048576,wsize=1048576,nointr,proto=tcp,nosuid,forcedirectio,noac`
For the above platforms, depending on NFS version used, additional options vers=3 or vers=4.x is added (x varies depending on what that platform supports. e.g. vers=4 or vers=4.1)
Linux (NFSv3)	CODE `-t nfs rw,bg,hard,rsize=1048576,wsize=1048576,nointr,timeo=600,tcp,nosuid,sec=sys,vers=3,actimeo=0`
Linux (NFSv4)	CODE `-t nfs4 rw,bg,hard,rsize=1048576,wsize=1048576,nointr,timeo=600,tcp,nosuid,sec=sys,actimeo=0`

For both Single instance and RAC, "port=2049" option is added for all platforms.
For AIX, rsize=<value>,wsize=<value> options are added depending on the value returned by "/usr/sbin/nfso -o nfs_max_read_size" and "/usr/sbin/nfso -o nfs_max_write_size" commands.

Oracle unmount options

"-f" is used for all platforms. For Linux, "-lf" is used.

Oracle mount options for single instance
AIX	CODE `cio,rw,bg,hard,intr,timeo=600,proto=tcp,nosuid`
HPUX	CODE `rw,bg,hard,rsize=1048576,wsize=1048576,nointr,timeo=600,proto=tcp,nosuid,forcedirectio`
Solaris	CODE `rw,bg,hard,rsize=1048576,wsize=1048576,nointr,proto=tcp,nosuid,forcedirectio`
For the above platforms, depending on NFS version used, additional options vers=3 or vers=4.x is added (x varies depending on what that platform supports. e.g. vers=4 or vers=4.1)
Linux (NFSv3)	CODE `-t nfs rw,bg,hard,rsize=1048576,wsize=1048576,nointr,timeo=600,tcp,nosuid,sec=sys,vers=3`
Linux (NFSv4)	CODE `-t nfs4 rw,bg,hard,rsize=1048576,wsize=1048576,nointr,timeo=600,tcp,nosuid,sec=sys`