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runInstaller fails at CreateOUIProcess with permission denied

Just a short post on a problem I encountered recently.

I had to install 11.2 GI and right after running the installer I got a message saying permission denied. Below is the exact error:

[oracle@testdb grid]$ ./runInstaller -silent -showProgress -waitforcompletion -responseFile /u01/software/grid/response/grid_install_20140114.rsp
Starting Oracle Universal Installer...

Checking Temp space: must be greater than 120 MB.   Actual 7507 MB    Passed
Checking swap space: must be greater than 150 MB.   Actual 8191 MB    Passed
Preparing to launch Oracle Universal Installer from /tmp/OraInstall2015-01-15_12-12-20PM. Please wait ...Error in CreateOUIProcess(): 13
: Permission denied[/plain]

Quickly tracing the process I can see that it fails to execute the java installer:

27316 execve("/tmp/OraInstall2015-01-15_12-05-40PM/jdk/jre/bin/java", ["/tmp/OraInstall2015-01-15_12-05-"..., "-Doracle.installer.library_loc=/"..., "-Doracle.installer.oui_loc=/tmp/"..., "-Doracle.installer.bootstrap=TRU"..., "-Doracle.installer.startup_locat"..., "-Doracle.installer.jre_loc=/tmp/"..., "-Doracle.installer.nlsEnabled=\"T"..., "-Doracle.installer.prereqConfigL"..., "-Doracle.installer.unixVersion=2"..., "-mx150m", "-cp", "/tmp/OraInstall2015-01-15_12-05-"..., "oracle.install.ivw.crs.driver.CR"..., "-scratchPath", "/tmp/OraInstall2015-01-15_12-05-"..., "-sourceLoc", ...], [/* 22 vars */]) = -1 EACCES (Permission denied)

I never had this problem before, see similar behaviour with having selinux enabled but that wasn't the case.

Then why I remembered that while formatting a partition for u01 and adding to fstab I saw that tmp didn't have the default mount options:

/dev/mapper/vglocal00-tmp00 /tmp                    ext4    defaults,noexec 1 2

Indeed, the noexec option will not let you execute binaries that are on that partition. This server was built by a hosting provider and I guess this was part of thir default deployment process.

After removing the option and remounting /tmp (mount -o remount /tmp), installer was able to run successfully.