Generate syslog tags based on the name of the executable or link.

[ColinSullivan1]

When running multiple NATS servers on a machine and directing output to syslog, we need a way to differentiate the servers beyond process ID. One way to do this is to use the link or executable name used to launch the process. Users can then identify individual servers in the syslog output if they link to, or copy the NATS server. Current behavior will be maintained when using the default NATS server executable.

Given files gnatsd, a copy of gnatsd (gnatsd.1) and a link gnatsd-link:

-rwxr-xr-x  1 colinsullivan  staff  9084636 Oct 18 11:35 gnatsd
lrwxr-xr-x  1 colinsullivan  staff       10 Oct 18 11:38 gnatsd-link -> ./gnatsd
-rwxr-xr-x  1 colinsullivan  staff  9084636 Oct 18 11:36 gnatsd.1

The NATS server will generate syslog statements based on the link or executable name stripped of the path, demonstrated below. The command used is paired with a corresponding syslog statement.

# ../tmp/gnatsd -s udp://localhost:512
Oct 18 11:50:15 machinename gnatsd[92147] <Notice>: Starting nats-server version 0.9.4

# ./gnatsd.1 -s udp://localhost:512
Oct 18 11:50:38 machinename gnatsd.1[92173] <Notice>: Starting nats-server version 0.9.4

# ./gnatsd-link -s udp://localhost:512
Oct 18 11:51:28 machinename gnatsd-link[92188] <Notice>: Starting nats-server version 0.9.4

# gnatsd -s udp://localhost:512
Oct 18 11:52:26 machinename gnatsd[92296] <Notice>: Starting nats-server version 0.9.4

Note: An alternative is a command line parameter / server option.

[coveralls]

Coverage increased (+0.09%) to 89.837% when pulling c3753d4 on syslog-tag into 8da901f on master.