Consul : Health Check is failed to invoke: fork/exec but running manualy

Question

I run this command

/usr/bin/mysqladmin ping --host=192.168.56.35 --port=6033 --user=root --password=123

and it says

mysqld is alive

but when I added it in heallth check

   "check": {
     "args": ["/usr/bin/mysqladmin ping --host=192.168.56.35 --port=6033 --user=root password=123"],
     "interval": "3s"}
   }

the log says

[ERR] agent: Check "service:proxy2" failed to invoke: fork/exec /usr/bin/mysqladmin ping --host=192.168.56.35 --port=6033 --user=root password=123: no such file or directory

how can i resolve this?

Answer 1

"args" - should be an array of strings. Consul sees your single string as a command to execute, ignoring spaces.

Your check should look something like this:

   "check": {
     "args": ["/usr/bin/mysqladmin", "ping", "--host=192.168.56.35", "--port=6033", "--user=root", "password=123"],
     "interval": "3s"}
   }

Optionally you can use following instead, since string is passed to /bin/sh it doesn't have to be divided into substrings. (most examples in for Consul Checks use this syntax, so it should definitively work):

   "check": {
     "args": ["/bin/sh", "-c", "/usr/bin/mysqladmin ping --host=192.168.56.35 --port=6033 --user=root password=123"],
     "interval": "3s"}
   }

Also make sure that user under which Consul agent process is running is able to execute /usr/bin/mysqladmin otherwise you will get permission denied error.