Thank you [Was: Switching from 9.1 to 9.5 on Ubuntu 16.04]

Pavan and Fabio

I always felt Postgres was a good choice for me and your support in this 
list has really confirmed it.

Thank you very much

Cheers

Mike

On 22/08/2018 7:33 PM, pavan95 wrote:
> Mike,
>
>>> 2) If yes then stop 9.1 server and make sure only postgres 9.5 is in
> active  state(you can do this as "su postgres"  user)
>
>> Not sure what you mean? Not sure how to stop one server without stopping
> another. Typically I use sudo service postgres stop/start/restart and that
> seems to work on all together.
>
> See, in /etc/init.d/ folder postgres is created as service so action on that
> service will be equivalently effected for all the postgres instances on this
> server. For example you do have postgres 9.1,9.3,9.5 on the same ubuntu
> server and if you issue:
> service postgresql start/stop/restart
> it will actually affect all the 3 instances. So you need to be specific and
> issue command(as previously said) like :
> /usr/lib/postgresql/9.5/bin/pg_ctl -D "/var/lib/postgresql/9.5/main" start
> /usr/lib/postgresql/9.5/bin/pg_ctl -D "/var/lib/postgresql/9.5/main" stop
> etc...
>
> Note: for issuing above commands you should be postgres user(from OS level
> and DB level)
>
>>>> createdb --port=5432 --host=pq4 --template=template0 --encoding=UTF8
> --lc-collate=C --lc-ctype=C --username=miked --owner=miked train
>
>>> 3) Ensure the active listening postgres ports on the server by:
>>>             netstat -alp | grep "5432"
>>>
>> mike@pq4:~$ netstat -alp | grep "543"
>> (Not all processes could be identified, non-owned process info
>> will not be shown, you would have to be root to see it all.)
>> tcp        0      0 localhost:5431          *:*                     LISTEN
> -
>> tcp        0      0 pq4:5431                   *:*
> LISTEN      -
>> tcp        0      0 localhost:5433          *:*                     LISTEN
> -
>> unix  2      [ ACC ]     STREAM     LISTENING     31377    -
> /var/run/postgresql/.s.PGSQL.5432
>> unix  2      [ ACC ]     STREAM     LISTENING     31378    -
> /var/run/postgresql/.s.PGSQL.5433
>> unix  2      [ ACC ]     STREAM     LISTENING     31438    -
> /var/run/postgresql/.s.PGSQL.5431
>> mike@pq4:~$
> >From the above output you are trying to create a database on database port
> 5432 which is not active. Postgres is unable to understand how to create a
> database on a closed port(which is not going to work for sure). Ensure
> yourself that the port on which you are creating database is in open state
> and accepting client requests.
>
>>> 4) Later as same "su postgres user"
>>>
>> mike@pq4:~$ su postgres
>> Password:
>> su: Authentication failure
>> mike@pq4:~$ su postgres user
>> Password:
>> su: Authentication failure
>> mike@pq4:~$ sudo -u postgres psql
>> could not change directory to "/home/mike": Permission denied
>> psql (9.5.14)
>> Type "help" for help.
>>
>> postgres=# \password postgres
>> Enter new password:
>> Enter it again:
>> postgres=# \q
>> mike@pq4:~$ su postgres
>> Password:
>> su: Authentication failure
>> mike@pq4:~$
>>
>> As you can see I don't know how to change the postgres user password. Did
> it a few times just to be sure.
>
> Firstly, do you have root access for that server?
>
> If yes, you can issue sudo bash as the user(you will login to the server)
> and then you can change the password for the OS level postgres user like
> below:
>
> [root@pg4]# passwd postgres
> Changing password for user postgres.
> New password:
> Confirm New password:
>
> then password will be changed for that user and can try logging in as :
> [root@pg4]# su postgres
> [postgres@pg4]#
>
> Now issue the above said commands
>
> /usr/lib/postgresql/9.5/bin/pg_ctl -D "/var/lib/postgresql/9.5/main" start
> /usr/lib/postgresql/9.5/bin/pg_ctl -D "/var/lib/postgresql/9.5/main" stop
> etc..
>
>
> Which will work for sure...
>
>> What I would like to do is uninstall 9.1 and 9.3. How would I do that?
> issue the below command:
> *dpkg -l | grep postgresql *
>
> Consider removing the postgres versions you like to remove!! Anyways this is
> not a proper fix for your prob.
>
> Jus ensure the port is listening on your server to execute your createdb
> command. Acknowledge for further queries if any.
>
> Regards,
> Pavan,
> 9841380956
>
>
>
>
>
>
>
> --
> Sent from: http://www.postgresql-archive.org/PostgreSQL-novice-f2132464.html
>
>