ROR + A server is already running. Check …/tmp/pids/server.pid. Exiting

Question

In my Rails Project, I am trying to run two different servers at different port. But it fails by giving this error at console.

C:\\Rails>rails s
=> Boo         


        

Answer 1

Try to change the number in the pid file to another and save it.

Answer 2

ps aux | grep rails
           or 
bundle exec rails s -p 3001 -P tmp/pids/server2.pid

Answer 3

Step 1: remove .pid

C:/Rails/tmp/pids/server.pid.Exiting

# IN linux/unix shell
$ rm -rf <path to file>

Sometime this doesn't solve the problem, then you have to kill the process running by localhost, for such cases, follow STEP 2

STEP 2: List the process for localhost and kill it

# For Linux/Unix shell

$ lsof -wni tcp:3000

# output
COMMAND  PID  USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
ruby    5946 rails   11u  IPv4  79073      0t0  TCP *:3000 (LISTEN)
ruby    5946 rails   12u  IPv4 103786      0t0  TCP 127.0.0.1:3000->127.0.0.1:53612 (ESTABLISHED)

# Kill the running process
$ kill -9 5946

run your server again

rails server

Answer 4

I find myself coming back to this webpage a lot to find the lsof -wni tcp:3000 command so I've found this method to be easier.

If you get this message:

A server is already running. Check /Users/username/project/tmp/pids/server.pid.
Exiting

And if you're running on a unix system (mac or linux) you can run these commands:

$ cat /Users/username/project/tmp/pids/server.pid

# output

71030

# Kill the process

$ kill -9 71030

Then run your server again!

Answer 5

Remove that file: C:/Rails/tmp/pids/server.pid

Answer 6

You can see the PID for each proccess(the first column) :

ps vax | grep rails
// OR:  ps auxw | grep rails

5236 pts/1    Sl+    1:46   2   0.2 /usr/bin/ruby1.9.1 script/rails s -p 3001
5298 pts/2    Sl+    0:12   2   0.7 /usr/bin/ruby1.9.1 script/rails s -p 3003
7356 pts/5    Sl+    0:09   2   0.9 /usr/bin/ruby1.9.1 script/rails s -p 3002
7846 pts/3    Sl+    0:19   2   1.7 /usr/bin/ruby1.9.1 script/rails s

Then kill the server:

kill -9 <pid>

To kill all running apps with "rails" in the name:

killall -9 rails