Thread: Pgpool with high availability

Pgpool with high availability

From

vijay patil

Date:

28 May, 11:31:51

HI Team,

"I'm encountering challenges while configuring Pgpool with high availability. The initial setup is completed, and Pgpool is operational on a single node, functioning without issues. However, upon attempting to start Pgpool on any additional nodes, particularly node 2, it becomes immediately unreachable.

I'm seeking assistance to address this issue. My setup consists of three nodes, each hosting both PostgreSQL and Pgpool services."

Thanks

Vijay

Re: Pgpool with high availability

From

Kashif Zeeshan

Date:

28 May, 19:54:22

Hi Vijay

Can you please share the error log, as from the description its hard to figure out the issue causing this problem.

Regards

Kashif Zeeshan

Bitnine Global

On Tue, May 28, 2024 at 9:42 PM vijay patil <vijay.postgres@gmail.com> wrote:

HI Team,
"I'm encountering challenges while configuring Pgpool with high availability. The initial setup is completed, and Pgpool is operational on a single node, functioning without issues. However, upon attempting to start Pgpool on any additional nodes, particularly node 2, it becomes immediately unreachable.
I'm seeking assistance to address this issue. My setup consists of three nodes, each hosting both PostgreSQL and Pgpool services."

Thanks
Vijay

Re: Pgpool with high availability

From

Adrian Klaver

Date:

28 May, 21:01:20

On 5/28/24 1:31 AM, vijay patil wrote:
> 
> HI Team,
> 
> "I'm encountering challenges while configuring Pgpool with high 
> availability. The initial setup is completed, and Pgpool is operational 
> on a single node, functioning without issues. However, upon attempting 
> to start Pgpool on any additional nodes, particularly node 2, it becomes 
> immediately unreachable.

And how we are supposed to arrive at an answer with essentially no 
information provided?

Need:

1) Configuration for initial setup.

2) A more detailed explanation of what "... upon attempting
to start Pgpool on any additional nodes" means? Include configuration 
changes.

3) The error messages.

4) Where the nodes are located?

> 
> I'm seeking assistance to address this issue. My setup consists of three 
> nodes, each hosting both PostgreSQL and Pgpool services."
> 
> 
> Thanks
> 
> Vijay
> 

-- 
Adrian Klaver
adrian.klaver@aklaver.com

Re: Pgpool with high availability

From

vijay patil

Date:

29 May, 08:15:39

Hi Adrian,

After modifying the pgpool.conf configuration to correct a subnet mistake, Previously, the wrong subnet was specified as /26, and it has now been corrected to /24. The configuration changes were as follows:

Previous Configuration:

delegate_ip = '10.127.1.18'

if_up_cmd = '/sbin/ip addr add $_IP_$/26 dev eth0 label eth0:1'

if_down_cmd = '/sbin/ip addr del $_IP_$/26 dev eth0'

arping_cmd = '/usr/sbin/arping -U $_IP_$ -w 1 -I eth0'

Updated Configuration:

delegate_ip = '10.127.1.18'

if_up_cmd = '/sbin/ip addr add $_IP_$/24 dev eth0 label eth0:1'

if_down_cmd = '/sbin/ip addr del $_IP_$/24 dev eth0'

arping_cmd = '/usr/sbin/arping -U $_IP_$ -w 1 -I eth0'

Current Issue:-

Following the subnet correction, the Virtual IP (VIP) 10.127.1.18 is now reachable only from the leader node (ha0002), while it remains unreachable from the standby nodes (ha0001 and ha0003). Below are the details of the connectivity status and the commands executed:

Leader Node (ha0002)

[root@staging-ha0002 PG_LOGS]# ping 10.127.1.18

PING 10.127.1.18 (10.127.1.18) 56(84) bytes of data.

64 bytes from 10.127.1.18: icmp_seq=1 ttl=64 time=0.041 ms

64 bytes from 10.127.1.18: icmp_seq=2 ttl=64 time=0.058 ms

64 bytes from 10.127.1.18: icmp_seq=3 ttl=64 time=0.060 ms

--- 10.127.1.18 ping statistics ---

3 packets transmitted, 3 received, 0% packet loss, time 2080ms

rtt min/avg/max/mdev = 0.041/0.053/0.060/0.008 ms

[root@staging-ha0002 PG_LOGS]# ping 10.127.1.18

PING 10.127.1.18 (10.127.1.18) 56(84) bytes of data.

64 bytes from 10.127.1.18: icmp_seq=1 ttl=64 time=0.041 ms

64 bytes from 10.127.1.18: icmp_seq=2 ttl=64 time=0.058 ms

64 bytes from 10.127.1.18: icmp_seq=3 ttl=64 time=0.060 ms

--- 10.127.1.18 ping statistics ---

3 packets transmitted, 3 received, 0% packet loss, time 2080ms

rtt min/avg/max/mdev = 0.041/0.053/0.060/0.008 ms

[pgbigboss@staging-ha0002 ~]$ pcp_watchdog_info -h 10.127.1.18 -p 9898 -U pgbigboss -W

Password:

3 3 YES ha0002:9999 Linux staging-ha0002 ha0002

ha0002:9999 Linux staging-ha0002 ha0002 9999 9000 4 LEADER 0 MEMBER

ha0001:9999 Linux staging-ha0001 ha0001 9999 9000 7 STANDBY 0 MEMBER

ha0003:9999 Linux staging-ha0003 ha0003 9999 9000 7 STANDBY 0 MEMBER

Standby Node (ha0001)

[root@staging-ha0001 ~]# ping 10.127.1.18

PING 10.127.1.18 (10.127.1.18) 56(84) bytes of data.

From 10.127.1.10 icmp_seq=1 Destination Host Unreachable

From 10.127.1.10 icmp_seq=2 Destination Host Unreachable

From 10.127.1.10 icmp_seq=3 Destination Host Unreachable

--- 10.127.1.18 ping statistics ---

5 packets transmitted, 0 received, +3 errors, 100% packet loss, time 4126ms

pipe 3

[pgbigboss@staging-ha0001 ~]$ pcp_watchdog_info -h 10.127.1.18 -p 9898 -U pgbigboss -W

Password:

ERROR: connection to host "10.127.1.18" failed with error "No route to host"

The VIP 10.127.1.18 is accessible from the leader node (ha0002) but not from the standby nodes (ha0001 and ha0003).

Thanks

Vijay

On Tue, May 28, 2024 at 11:31 PM Adrian Klaver <adrian.klaver@aklaver.com> wrote:

On 5/28/24 1:31 AM, vijay patil wrote:
>
> HI Team,
>
> "I'm encountering challenges while configuring Pgpool with high
> availability. The initial setup is completed, and Pgpool is operational
> on a single node, functioning without issues. However, upon attempting
> to start Pgpool on any additional nodes, particularly node 2, it becomes
> immediately unreachable.

And how we are supposed to arrive at an answer with essentially no
information provided?

Need:

1) Configuration for initial setup.

2) A more detailed explanation of what "... upon attempting
to start Pgpool on any additional nodes" means? Include configuration
changes.

3) The error messages.

4) Where the nodes are located?

>
> I'm seeking assistance to address this issue. My setup consists of three
> nodes, each hosting both PostgreSQL and Pgpool services."
>
>
> Thanks
>
> Vijay
>

--
Adrian Klaver
adrian.klaver@aklaver.com

Re: Pgpool with high availability

From

Muhammad Imtiaz

Date:

29 May, 08:28:18

Hi,

Can you please provide the Pgpool logs? Additionally, in a distributed environment, ensure that Pgpool is properly configured. You can follow these documented steps to set up the Pgpool configurations pgpool.conf,pcp.conf and pool_hba.conf .

Regards,
Muhammad Imtiaz

On Tue, 28 May 2024 at 23:01, Adrian Klaver <adrian.klaver@aklaver.com> wrote:

On 5/28/24 1:31 AM, vijay patil wrote:
>
> HI Team,
>
> "I'm encountering challenges while configuring Pgpool with high
> availability. The initial setup is completed, and Pgpool is operational
> on a single node, functioning without issues. However, upon attempting
> to start Pgpool on any additional nodes, particularly node 2, it becomes
> immediately unreachable.

And how we are supposed to arrive at an answer with essentially no
information provided?

Need:

1) Configuration for initial setup.

2) A more detailed explanation of what "... upon attempting
to start Pgpool on any additional nodes" means? Include configuration
changes.

3) The error messages.

4) Where the nodes are located?

>
> I'm seeking assistance to address this issue. My setup consists of three
> nodes, each hosting both PostgreSQL and Pgpool services."
>
>
> Thanks
>
> Vijay
>

--
Adrian Klaver
adrian.klaver@aklaver.com

Re: Pgpool with high availability

From

vijay patil

Date:

29 May, 09:20:28

Thanks Muhammad !

Here i uploaded details.

Thanks

Vijay

On Wed, May 29, 2024 at 10:58 AM Muhammad Imtiaz <imtiaz.m@bitnine.net> wrote:

Hi,

Can you please provide the Pgpool logs? Additionally, in a distributed environment, ensure that Pgpool is properly configured. You can follow these documented steps to set up the Pgpool configurations pgpool.conf,pcp.conf and pool_hba.conf .

Regards,
Muhammad Imtiaz

On Tue, 28 May 2024 at 23:01, Adrian Klaver <adrian.klaver@aklaver.com> wrote:

On 5/28/24 1:31 AM, vijay patil wrote:
>
> HI Team,
>
> "I'm encountering challenges while configuring Pgpool with high
> availability. The initial setup is completed, and Pgpool is operational
> on a single node, functioning without issues. However, upon attempting
> to start Pgpool on any additional nodes, particularly node 2, it becomes
> immediately unreachable.

And how we are supposed to arrive at an answer with essentially no
information provided?

Need:

1) Configuration for initial setup.

2) A more detailed explanation of what "... upon attempting
to start Pgpool on any additional nodes" means? Include configuration
changes.

3) The error messages.

4) Where the nodes are located?

>
> I'm seeking assistance to address this issue. My setup consists of three
> nodes, each hosting both PostgreSQL and Pgpool services."
>
>
> Thanks
>
> Vijay
>

--
Adrian Klaver
adrian.klaver@aklaver.com

Attachment

Re: Pgpool with high availability

From

Adrian Klaver

Date:

29 May, 17:14:49

On 5/28/24 22:15, vijay patil wrote:
> Hi Adrian,
> 
> After modifying the pgpool.conf configuration to correct a subnet 
> mistake,  Previously, the wrong subnet was specified as /26, and it has 
> now been corrected to /24. The configuration changes were as follows:

This seems to be a networking issue:

[root@staging-ha0001 ~]# ping 10.127.1.18

PING 10.127.1.18 (10.127.1.18) 56(84) bytes of data.

 From 10.127.1.10 icmp_seq=1 Destination Host Unreachable

<...>


Where are ha0001 and ha0003 on the network relative to ha0002?

Also are they reachable for other services?


-- 
Adrian Klaver
adrian.klaver@aklaver.com

Re: Pgpool with high availability

From

Kashif Zeeshan

Date:

30 May, 06:47:11

Hi Vijay

The log shows that all the nodes are able to communicate now (master, standby and standby1) and now what are the issue you are facing?

Regards

Kashif Zeeshan

On Thu, May 30, 2024 at 2:00 AM vijay patil <vijay.postgres@gmail.com> wrote:

Thanks Muhammad !

Here i uploaded details.

Thanks
Vijay

On Wed, May 29, 2024 at 10:58 AM Muhammad Imtiaz <imtiaz.m@bitnine.net> wrote:
Hi,

Can you please provide the Pgpool logs? Additionally, in a distributed environment, ensure that Pgpool is properly configured. You can follow these documented steps to set up the Pgpool configurations pgpool.conf,pcp.conf and pool_hba.conf .

Regards,
Muhammad Imtiaz

On Tue, 28 May 2024 at 23:01, Adrian Klaver <adrian.klaver@aklaver.com> wrote:

On 5/28/24 1:31 AM, vijay patil wrote:
>
> HI Team,
>
> "I'm encountering challenges while configuring Pgpool with high
> availability. The initial setup is completed, and Pgpool is operational
> on a single node, functioning without issues. However, upon attempting
> to start Pgpool on any additional nodes, particularly node 2, it becomes
> immediately unreachable.

And how we are supposed to arrive at an answer with essentially no
information provided?

Need:

1) Configuration for initial setup.

2) A more detailed explanation of what "... upon attempting
to start Pgpool on any additional nodes" means? Include configuration
changes.

3) The error messages.

4) Where the nodes are located?

>
> I'm seeking assistance to address this issue. My setup consists of three
> nodes, each hosting both PostgreSQL and Pgpool services."
>
>
> Thanks
>
> Vijay
>

--
Adrian Klaver
adrian.klaver@aklaver.com

Re: Pgpool with high availability

From

vijay patil

Date:

30 May, 07:06:39

HI Kashif,

The VIP 10.127.1.18 is accessible from the leader node (ha0002) only but not from the standby nodes (ha0001 and ha0003).

Thanks

Vijay

On Thu, May 30, 2024 at 9:17 AM Kashif Zeeshan <kashi.zeeshan@gmail.com> wrote:

Hi Vijay

The log shows that all the nodes are able to communicate now (master, standby and standby1) and now what are the issue you are facing?

Regards
Kashif Zeeshan

On Thu, May 30, 2024 at 2:00 AM vijay patil <vijay.postgres@gmail.com> wrote:
Thanks Muhammad !

Here i uploaded details.

Thanks
Vijay

On Wed, May 29, 2024 at 10:58 AM Muhammad Imtiaz <imtiaz.m@bitnine.net> wrote:
Hi,

Can you please provide the Pgpool logs? Additionally, in a distributed environment, ensure that Pgpool is properly configured. You can follow these documented steps to set up the Pgpool configurations pgpool.conf,pcp.conf and pool_hba.conf .

Regards,
Muhammad Imtiaz

On Tue, 28 May 2024 at 23:01, Adrian Klaver <adrian.klaver@aklaver.com> wrote:

On 5/28/24 1:31 AM, vijay patil wrote:
>
> HI Team,
>
> "I'm encountering challenges while configuring Pgpool with high
> availability. The initial setup is completed, and Pgpool is operational
> on a single node, functioning without issues. However, upon attempting
> to start Pgpool on any additional nodes, particularly node 2, it becomes
> immediately unreachable.

And how we are supposed to arrive at an answer with essentially no
information provided?

Need:

1) Configuration for initial setup.

2) A more detailed explanation of what "... upon attempting
to start Pgpool on any additional nodes" means? Include configuration
changes.

3) The error messages.

4) Where the nodes are located?

>
> I'm seeking assistance to address this issue. My setup consists of three
> nodes, each hosting both PostgreSQL and Pgpool services."
>
>
> Thanks
>
> Vijay
>

--
Adrian Klaver
adrian.klaver@aklaver.com