Ability to use environment variables with running process

[krnekit]

It would be useful, if I can set environment variables not only before script start but when it already running. For example:

pm2 start processes.json
PM2_GRACEFUL_TIMEOUT=60000 pm2 gracefulRestart foobar

At the moment I can only specify it before starting script.

[soyuka]

Noticed, closing because it's likely the same issue as #528, you want to reload environment variables when restarting.

[rlidwka]

you want to reload environment variables when restarting

override old values with memory, not reload:

$ PM2_GRACEFUL_TIMEOUT=60000 pm2 gracefulRestart foobar
# it's 60k
$ pm2 gracefulRestart foobar
# still 60k
$ PM2_GRACEFUL_TIMEOUT=30000 pm2 gracefulRestart foobar
# 30k now
$ pm2 gracefulRestart foobar
# still 30k

Looks pretty doable.

PS: oh wait... pm2 doesn't see those overrides, it sees the entire environment. Oops... Yep, I don't know how to do this. Maybe merge environments somehow...