set umask for tomcat8 via tomcat.service

Question

I am trying to set a custom umask for a tomcat 8 instance, tried to make it the good way by using the UMask directive in systemd tomcat unit as seen here without luck.

I'd like to set a 022 umask cause the company dev needs to access tomcat / application logs and they are not in the same group as the tomcat user....

the crazy thing is that the systemd doc says :

Controls the file mode creation mask. Takes an access mode in octal notation. See umask(2) for details. Defaults to 0022.

But the logs (application / tomcat) are set to 640 (not the expected 755) :

-rw-r----- 1 top top 21416 Feb  1 09:58 catalina.out

My service file :

# Systemd unit file for tomcat
[Unit]
Description=Apache Tomcat Web Application Container
After=syslog.target network.target

[...]

User=top
Group=top
UMask=0022

[Install]
WantedBy=multi-user.target

Any thoughts about this ?

Thanks

Answer 1

Try adding UMASK as Environment variable into tomcat's service file:

[Service]
...
Environment='UMASK=0022'
...

Default catalina.sh is checking for environment's $UMASK:

# Set UMASK unless it has been overridden
 if [ -z "$UMASK" ]; then
  UMASK="0027"
 fi
 umask $UMASK

(It seems to me, that UMask from systemd is not used by Tomcat, but I am not completely sure.)

Answer 2

I think you can achieve this with systemd by doing the following:

~]# mkdir -p /etc/systemd/system/tomcat.service.d
~]# echo -e "[Service]\nUMask=0022" >/etc/systemd/system/tomcat.service.d/custom-umask.conf
~]# systemctl daemon-reload
~]# systemctl restart tomcat

/etc/systemd/system/tomcat.service.d/umask-user.conf should overwrite the default values.

Source: https://access.redhat.com/solutions/2220161

P.S: A umask of 0022 would give a file 0644 permissions and a directory 0755