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amazon ec2 - Unable to start the Phusion Passenger - Cannot change the directory - Operation not permitted (errno=1)



I'm running Red Hat Enterprise Linux Server release 6.4 (Santiago) on Amazon EC2.



I have installed Phusion Passenger via a gem.



When I start httpd I have this error message in less /var/log/httpd/error_log





[Tue Jan 21 08:07:43 2014] [notice] SELinux policy enabled; httpd
running as context unconfined_u:system_r:httpd_t:s0



[Tue Jan 21 08:07:43 2014] [notice] suEXEC mechanism enabled (wrapper:
/usr/sbin/suexec)



[Tue Jan 21 08:07:43 2014] [error] *** Passenger could not be
initialized because of this error: Unable to start the Phusion
Passenger watchdog because it encountered the following error during

startup: Cannot change the directory
'/tmp/passenger.1.0.2072/generation-0/buffered_uploads' its UID to 48
and GID to 48: Operation not permitted (errno=1)




Output of sestatus




SELinux status: enabled




SELinuxfs mount: /selinux



Current mode: enforcing



Mode from config file: enforcing



Policy version: 24



Policy from config file: targeted





Content of /var/log/audit/audit.log related to PassengerWatchd




type=AVC msg=audit(1390309663.196:134): avc: denied { sys_resource }
for pid=2077 comm="PassengerWatchd" capability=24
scontext=unconfined_u:system_r:httpd_sys_script_t:s0
tcontext=unconfined_u:system_r:httpd_sys_script_t:s0 tclass=capability
type=SYSCALL msg=audit(1390309663.196:134): arch=c000003e syscall=1
success=no exit=-13 a0=5 a1=7f0c303ad000 a2=6 a3=ffffffff items=0

ppid=2075 pid=2077 auid=500 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0
sgid=0 fsgid=0 tty=(none) ses=4 comm="PassengerWatchd"
exe="/opt/walk-manager/vendor/bundle/ruby/2.0.0/gems/passenger-4.0.26/buildout/agents/PassengerWatchdog"
subj=unconfined_u:system_r:httpd_sys_script_t:s0 key=(null)




I'm new to SELinux so I don't know what other information I can provide here



I've made the installation of my entire project as root and as root I'm trying to start httpd the default user ec2-user doesn't have permission to start httpd


Answer




There are two approaches:




  1. disable SELinux

  2. go through the SELinux audit log and add exceptions for the service. See here. Essentially you would need to use audit2allow to create the exceptions, restart HTTPD, find the next set of exceptions and repeat until you go them all.


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