Обсуждение: using pg_ctl over ssh hangs

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using pg_ctl over ssh hangs

От
Sbob
Дата:

All


I am wanting to run pg_ctl as a command over ssh, however when I pass start it hangs until I do a Ctl-C


This works fine:
$ node3=172.16.171.132
$ ssh -T postgres@${node3} "/usr/pgsql-14/bin/pg_ctl -D /var/lib/pgsql/14/data stop"
waiting for server to shut down.... done
server stopped
$

I am immediately returned to a command prompt

However , this does not return me to a command prompt until I do a Ctl-C:


$ node3=172.16.171.132


$ ssh -T postgres@${node3} "/usr/pgsql-14/bin/pg_ctl -D /var/lib/pgsql/14/data start"
waiting for server to start....2023-10-19 19:23:42.947 MDT [2053] LOG:  redirecting log output to logging collector process
2023-10-19 19:23:42.947 MDT [2053] HINT:  Future log output will appear in directory "log".
done
server started

^C
$



Thanks in advance


Re: using pg_ctl over ssh hangs

От
"David G. Johnston"
Дата:
On Thursday, October 19, 2023, Sbob <sbob@quadratum-braccas.com> wrote:


$ ssh -T postgres@${node3} "/usr/pgsql-14/bin/pg_ctl -D /var/lib/pgsql/14/data start"
waiting for server to start....2023-10-19 19:23:42.947 MDT [2053] LOG:  redirecting log output to logging collector process
2023-10-19 19:23:42.947 MDT [2053] HINT:  Future log output will appear in directory "log".
done
server started

^C 


This has nothing to do with ssh.  The start command is behaving as documented.  Read the documentation for it to understand why, and what your options are.

David J.

Re: using pg_ctl over ssh hangs

От
Tom Lane
Дата:
Sbob <sbob@quadratum-braccas.com> writes:
> I am wanting to run pg_ctl as a command over ssh, however when I pass 
> start it hangs until I do a Ctl-C

> $ ssh -T postgres@${node3} "/usr/pgsql-14/bin/pg_ctl -D 
> /var/lib/pgsql/14/data start"

If you don't specify a log file (-l option to pg_ctl) then the
postmaster's stdout doesn't get dissociated from the calling terminal,
which likely explains why ssh doesn't think the session is done.

            regards, tom lane

Re: using pg_ctl over ssh hangs

От
vrms
Дата:
even though this may not be 100% what you where asking for ...

the first thing that comes to mind would be trying to send the remote command into the background

    $ ssh -T postgres@${node3} "/usr/pgsql-14/bin/pg_ctl -D /var/lib/pgsql/14/data start &"

this may come with the disadvantage that you do not receive the "server started" feedback.

the second was to try Ansible

- name: start postgres @ node 3
  hosts: node3
  tasks:

  - name: start postgresql
    ansible.builtin.cmd
      cmd: "/usr/pgsql-14/bin/pg_ctl -D /var/lib/pgsql/14/data start"
    become: true
    become_user: postgres  


this of course requires for you to have Ansible available (which may come handy anyway).



On 20.10.23 03:24, Sbob wrote:

All


I am wanting to run pg_ctl as a command over ssh, however when I pass start it hangs until I do a Ctl-C


This works fine:
$ node3=172.16.171.132
$ ssh -T postgres@${node3} "/usr/pgsql-14/bin/pg_ctl -D /var/lib/pgsql/14/data stop"
waiting for server to shut down.... done
server stopped
$

I am immediately returned to a command prompt

However , this does not return me to a command prompt until I do a Ctl-C:


$ node3=172.16.171.132


$ ssh -T postgres@${node3} "/usr/pgsql-14/bin/pg_ctl -D /var/lib/pgsql/14/data start"
waiting for server to start....2023-10-19 19:23:42.947 MDT [2053] LOG:  redirecting log output to logging collector process
2023-10-19 19:23:42.947 MDT [2053] HINT:  Future log output will appear in directory "log".
done
server started

^C
$



Thanks in advance