[pgpool-general: 1150] Re: watchdog enabled delegate_IP on multiple nodes simultaneously
Yugo Nagata
nagata at sraoss.co.jp
Tue Oct 30 11:42:10 JST 2012
Oh, sorry. I'll confirm it.
On Mon, 29 Oct 2012 19:33:44 -0700
Lonni J Friedman <netllama at gmail.com> wrote:
> I thought I did in the previous email:
> detaching pgpool from all the nodes (using pcp_detach_node).
>
> On Mon, Oct 29, 2012 at 7:32 PM, Yugo Nagata <nagata at sraoss.co.jp> wrote:
> > Could you please provide the way to reproduce it ?
> >
> > On Mon, 29 Oct 2012 13:06:30 -0700
> > Lonni J Friedman <netllama at gmail.com> wrote:
> >
> >> I'm now seeing this behavior with replication mode too. I seem to
> >> have triggered it by detaching pgpool from all the nodes (using
> >> pcp_detach_node).
> >>
> >> This is a rather bad situation, as I've now got two different pgpool
> >> servers responding on the same IP address.
> >>
> >> On Tue, Oct 16, 2012 at 7:36 AM, Lonni J Friedman <netllama at gmail.com> wrote:
> >> > Yes, I believe that's correct. I had a single database server, with
> >> > pgpool sitting in front of it for connection pooling & pgpool
> >> > failover.
> >> >
> >> > On Tue, Oct 16, 2012 at 12:50 AM, Tatsuo Ishii <ishii at postgresql.org> wrote:
> >> >>> Our investigation showed that the problem could occur if pgpool is
> >> >>> running in RAW mode (i.e. neither replication mode nor master slave
> >> >>> mode if off). Is this your case?
> >> >>
> >> >> Oops. I meant "neither replication mode nor master slave mode is on"
> >> >> --
> >> >> Tatsuo Ishii
> >> >> SRA OSS, Inc. Japan
> >> >> English: http://www.sraoss.co.jp/index_en.php
> >> >> Japanese: http://www.sraoss.co.jp
> >> >>
> >> >>>> Any new status on this investigation?
> >> >>>>
> >> >>>> On Mon, Oct 1, 2012 at 7:10 AM, Lonni J Friedman <netllama at gmail.com> wrote:
> >> >>>>> Thanks for your reply. Let me know if you need any other info from me.
> >> >>>>>
> >> >>>>> On Mon, Oct 1, 2012 at 2:42 AM, Yugo Nagata <nagata at sraoss.co.jp> wrote:
> >> >>>>>> I'm investigating the cause of this.
> >> >>>>>>
> >> >>>>>> From the log, it seems that both pgpools failed connecting to DB (cuda-db0)
> >> >>>>>> temporarily. In this period both services of pgpools was down. After the
> >> >>>>>> connection to the DB recovered, both pgpools might consider the other is
> >> >>>>>> still down each other, and escalate to active server (VIP holder).
> >> >>>>>>
> >> >>>>>> I'm going to reproduce it.
> >> >>>>>>
> >> >>>>>> On Sun, 30 Sep 2012 12:38:12 -0700
> >> >>>>>> Lonni J Friedman <netllama at gmail.com> wrote:
> >> >>>>>>
> >> >>>>>>> No ideas or suggestions?
> >> >>>>>>>
> >> >>>>>>> On Wed, Sep 26, 2012 at 9:05 AM, Lonni J Friedman <netllama at gmail.com> wrote:
> >> >>>>>>> > I'm running 3.2.0 on two Linux servers, with use_watchdog=on. Two
> >> >>>>>>> > days ago, I noticed that the watchdog enabled the delegate_IP on both
> >> >>>>>>> > servers simultaneously (and remains in that state as of today). This
> >> >>>>>>> > seems like the wrong behavior. I was under the impression that the
> >> >>>>>>> > delegate_IP should be up on only 1 server at any time? I suppose this
> >> >>>>>>> > might be harmless, as long as both servers are otherwise working ok,
> >> >>>>>>> > but it seems to defeat the point of enabling the IP only when the
> >> >>>>>>> > other server is down, if they're both up simultaneously.
> >> >>>>>>> >
> >> >>>>>>> > I've verified that both servers are responding by pinging the
> >> >>>>>>> > delegate_IP (from a separate system), and checking the HWaddress from
> >> >>>>>>> > the 'arp' command. If I then purge the arp cache and ping again, it
> >> >>>>>>> > will eventually show the other server's HWaddress associated with the
> >> >>>>>>> > delegate_IP.
> >> >>>>>>> >
> >> >>>>>>> > In the pgpool logs on both servers, I do see the following around the
> >> >>>>>>> > time that this happened:
> >> >>>>>>> > wd_lifecheck: lifecheck failed 3 times. pgpool seems not to be working
> >> >>>>>>> >
> >> >>>>>>> > My primary concern is why both servers have the delegate_IP up
> >> >>>>>>> > simultaneously when there was clearly some sort of problem that should
> >> >>>>>>> > have caused it to be brought down on at least 1 of them.
> >> >>>>>>> >
> >> >>>>>>> > Both servers can communicate with each other (they can ping each
> >> >>>>>>> > other, and I can invoke psql to connect to localhost pgpool from both
> >> >>>>>>> > servers). Here are all the uncommented settings in the WATCHDOG
> >> >>>>>>> > section of pgpool.conf (with wd_hostname differing for each server):
> >> >>>>>>> > #########
> >> >>>>>>> > use_watchdog = on
> >> >>>>>>> > # Activates watchdog
> >> >>>>>>> > trusted_servers = 'cuda-fs1,cuda-vm0,cuda-fs2'
> >> >>>>>>> > # trusted server list which are used
> >> >>>>>>> > # to confirm network connection
> >> >>>>>>> > # (hostA,hostB,hostC,...)
> >> >>>>>>> > delegate_IP = '10.31.97.78'
> >> >>>>>>> > # delegate IP address
> >> >>>>>>> > wd_hostname = '10.31.99.166'
> >> >>>>>>> > # Host name or IP address of this watchdog
> >> >>>>>>> > wd_port = 9000
> >> >>>>>>> > # port number for watchdog service
> >> >>>>>>> > wd_interval = 10
> >> >>>>>>> > # lifecheck interval (sec) > 0
> >> >>>>>>> > ping_path = '/bin'
> >> >>>>>>> > # ping command path
> >> >>>>>>> > ifconfig_path = '/sbin'
> >> >>>>>>> > # ifconfig command path
> >> >>>>>>> > if_up_cmd = 'ifconfig eth0:0 inet $_IP_$ netmask 255.255.252.0'
> >> >>>>>>> > # startup delegate IP command
> >> >>>>>>> > if_down_cmd = 'ifconfig eth0:0 down'
> >> >>>>>>> > # shutdown delegate IP command
> >> >>>>>>> > arping_path = '/usr/sbin' # arping command path
> >> >>>>>>> > arping_cmd = 'arping -U $_IP_$ -w 1'
> >> >>>>>>> > # arping command
> >> >>>>>>> > wd_life_point = 3
> >> >>>>>>> > # lifecheck retry times
> >> >>>>>>> > wd_lifecheck_query = 'SELECT 1'
> >> >>>>>>> > # lifecheck query to pgpool from watchdog
> >> >>>>>>> > other_pgpool_hostname0 = '10.31.99.165'
> >> >>>>>>> > # Host name or IP address to
> >> >>>>>>> > connect to for other pgpool 0
> >> >>>>>>> > other_pgpool_port0 = 9999
> >> >>>>>>> > # Port number for othet pgpool 0
> >> >>>>>>> > other_wd_port0 = 9000
> >> >>>>>>> > #########
> >> >>>>>>> >
> >> >>>>>>> > Here's ifconfig output from each server. First 10.31.99.165:
> >> >>>>>>> > #########
> >> >>>>>>> > eth0 Link encap:Ethernet HWaddr 52:54:00:FC:5A:DD
> >> >>>>>>> > inet addr:10.31.99.165 Bcast:10.31.99.255 Mask:255.255.252.0
> >> >>>>>>> > inet6 addr: fe80::5054:ff:fefc:5add/64 Scope:Link
> >> >>>>>>> > UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> >> >>>>>>> > RX packets:4195383952 errors:0 dropped:0 overruns:0 frame:0
> >> >>>>>>> > TX packets:4618638427 errors:0 dropped:0 overruns:0 carrier:0
> >> >>>>>>> > collisions:0 txqueuelen:1000
> >> >>>>>>> > RX bytes:5682945530436 (5.1 TiB) TX bytes:7468635177326 (6.7 TiB)
> >> >>>>>>> >
> >> >>>>>>> > eth0:0 Link encap:Ethernet HWaddr 52:54:00:FC:5A:DD
> >> >>>>>>> > inet addr:10.31.97.78 Bcast:10.31.99.255 Mask:255.255.252.0
> >> >>>>>>> > UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> >> >>>>>>> > #########
> >> >>>>>>> >
> >> >>>>>>> > And 10.31.99.166:
> >> >>>>>>> > #########
> >> >>>>>>> > eth0 Link encap:Ethernet HWaddr 00:16:3E:87:6F:43
> >> >>>>>>> > inet addr:10.31.99.166 Bcast:10.31.99.255 Mask:255.255.252.0
> >> >>>>>>> > inet6 addr: fe80::216:3eff:fe87:6f43/64 Scope:Link
> >> >>>>>>> > UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> >> >>>>>>> > RX packets:4618130586 errors:0 dropped:0 overruns:0 frame:0
> >> >>>>>>> > TX packets:200152071 errors:0 dropped:0 overruns:0 carrier:0
> >> >>>>>>> > collisions:0 txqueuelen:1000
> >> >>>>>>> > RX bytes:5702786076291 (5.1 TiB) TX bytes:15085410736 (14.0 GiB)
> >> >>>>>>> >
> >> >>>>>>> > eth0:0 Link encap:Ethernet HWaddr 00:16:3E:87:6F:43
> >> >>>>>>> > inet addr:10.31.97.78 Bcast:10.31.99.255 Mask:255.255.252.0
> >> >>>>>>> > UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> >> >>>>>>> > #########
> >> >>>>>>> >
> >> >>>>>>> > Here's the content of the pgpool log from 10.31.99.165:
> >> >>>>>>> > #########
> >> >>>>>>> > 2012-09-24 10:55:34 ERROR: pid 28064: new_connection: create_cp() failed
> >> >>>>>>> > 2012-09-24 10:55:34 LOG: pid 27612: wd_lifecheck: lifecheck failed 3
> >> >>>>>>> > times. pgpool seems not to be working
> >> >>>>>>> > 2012-09-24 10:55:34 LOG: pid 27612: wd_lifecheck: lifecheck failed 3
> >> >>>>>>> > times. pgpool seems not to be working
> >> >>>>>>> > 2012-09-24 10:55:45 ERROR: pid 28088: connect_inet_domain_socket:
> >> >>>>>>> > connect() failed: Connection refused
> >> >>>>>>> > 2012-09-24 10:55:45 ERROR: pid 28088: connection to cuda-db0(5432) failed
> >> >>>>>>> > 2012-09-24 10:55:45 ERROR: pid 28088: new_connection: create_cp() failed
> >> >>>>>>> > 2012-09-24 10:55:46 ERROR: pid 28086: connect_inet_domain_socket:
> >> >>>>>>> > connect() failed: Connection refused
> >> >>>>>>> > 2012-09-24 10:55:46 ERROR: pid 28086: connection to cuda-db0(5432) failed
> >> >>>>>>> > 2012-09-24 10:55:46 ERROR: pid 28086: new_connection: create_cp() failed
> >> >>>>>>> > 2012-09-24 10:55:46 LOG: pid 27612: wd_lifecheck: lifecheck failed 3
> >> >>>>>>> > times. pgpool seems not to be working
> >> >>>>>>> > 2012-09-24 10:55:46 LOG: pid 27612: wd_lifecheck: lifecheck failed 3
> >> >>>>>>> > times. pgpool seems not to be working
> >> >>>>>>> > 2012-09-24 10:55:57 ERROR: pid 28099: connect_inet_domain_socket:
> >> >>>>>>> > connect() failed: Connection refused
> >> >>>>>>> > 2012-09-24 10:55:57 ERROR: pid 28099: connection to cuda-db0(5432) failed
> >> >>>>>>> > 2012-09-24 10:55:57 ERROR: pid 28099: new_connection: create_cp() failed
> >> >>>>>>> > 2012-09-24 10:55:58 ERROR: pid 27674: connect_inet_domain_socket:
> >> >>>>>>> > connect() failed: Connection refused
> >> >>>>>>> > 2012-09-24 10:55:58 ERROR: pid 27674: connection to cuda-db0(5432) failed
> >> >>>>>>> > 2012-09-24 10:55:58 ERROR: pid 27674: new_connection: create_cp() failed
> >> >>>>>>> > 2012-09-24 10:55:58 LOG: pid 27612: wd_lifecheck: lifecheck failed 3
> >> >>>>>>> > times. pgpool seems not to be working
> >> >>>>>>> > 2012-09-24 10:55:58 LOG: pid 27612: wd_lifecheck: lifecheck failed 3
> >> >>>>>>> > times. pgpool seems not to be working
> >> >>>>>>> > 2012-09-24 10:56:09 ERROR: pid 28108: connect_inet_domain_socket:
> >> >>>>>>> > connect() failed: Connection refused
> >> >>>>>>> > 2012-09-24 10:56:09 ERROR: pid 28108: connection to cuda-db0(5432) failed
> >> >>>>>>> > 2012-09-24 10:56:09 ERROR: pid 28108: new_connection: create_cp() failed
> >> >>>>>>> > 2012-09-24 10:56:10 ERROR: pid 28106: connect_inet_domain_socket:
> >> >>>>>>> > connect() failed: Connection refused
> >> >>>>>>> > 2012-09-24 10:56:10 ERROR: pid 28106: connection to cuda-db0(5432) failed
> >> >>>>>>> > 2012-09-24 10:56:10 ERROR: pid 28106: new_connection: create_cp() failed
> >> >>>>>>> > 2012-09-24 10:56:10 LOG: pid 27612: wd_lifecheck: lifecheck failed 3
> >> >>>>>>> > times. pgpool seems not to be working
> >> >>>>>>> > 2012-09-24 10:56:10 LOG: pid 27612: wd_lifecheck: lifecheck failed 3
> >> >>>>>>> > times. pgpool seems not to be working
> >> >>>>>>> > 2012-09-24 10:56:22 LOG: pid 27612: wd_escalation: escalated to master pgpool
> >> >>>>>>> > 2012-09-24 10:56:24 LOG: pid 27612: wd_escalation: escaleted to
> >> >>>>>>> > delegate_IP holder
> >> >>>>>>> > 2012-09-24 10:57:04 LOG: pid 27813: send_failback_request: fail back
> >> >>>>>>> > 0 th node request from pid 27813
> >> >>>>>>> > 2012-09-24 10:57:04 ERROR: pid 27596: failover_handler: invalid
> >> >>>>>>> > node_id 0 status:2 MAX_NUM_BACKENDS: 128
> >> >>>>>>> > 2012-09-24 10:57:06 LOG: pid 27813: send_failback_request: fail back
> >> >>>>>>> > 1 th node request from pid 27813
> >> >>>>>>> > 2012-09-24 10:57:06 ERROR: pid 27596: failover_handler: invalid
> >> >>>>>>> > node_id 1 status:2 MAX_NUM_BACKENDS: 128
> >> >>>>>>> > 2012-09-24 10:57:09 LOG: pid 27813: send_failback_request: fail back
> >> >>>>>>> > 2 th node request from pid 27813
> >> >>>>>>> > 2012-09-24 10:57:09 ERROR: pid 27596: failover_handler: invalid
> >> >>>>>>> > node_id 2 status:2 MAX_NUM_BACKENDS: 128
> >> >>>>>>> > #########
> >> >>>>>>> >
> >> >>>>>>> > and 10.31.99.166:
> >> >>>>>>> > #########
> >> >>>>>>> > 2012-09-24 10:55:22 ERROR: pid 7192: new_connection: create_cp() failed
> >> >>>>>>> > 2012-09-24 10:55:22 LOG: pid 6724: wd_lifecheck: lifecheck failed 3
> >> >>>>>>> > times. pgpool seems not to be working
> >> >>>>>>> > 2012-09-24 10:55:22 LOG: pid 6724: wd_lifecheck: lifecheck failed 3
> >> >>>>>>> > times. pgpool seems not to be working
> >> >>>>>>> > 2012-09-24 10:55:22 ERROR: pid 7191: connect_inet_domain_socket:
> >> >>>>>>> > connect() failed: Connection refused
> >> >>>>>>> > 2012-09-24 10:55:22 ERROR: pid 7191: connection to cuda-db0(5432) failed
> >> >>>>>>> > 2012-09-24 10:55:22 ERROR: pid 7191: new_connection: create_cp() failed
> >> >>>>>>> > 2012-09-24 10:55:34 ERROR: pid 7202: connect_inet_domain_socket:
> >> >>>>>>> > connect() failed: Connection refused
> >> >>>>>>> > 2012-09-24 10:55:34 ERROR: pid 7202: connection to cuda-db0(5432) failed
> >> >>>>>>> > 2012-09-24 10:55:34 ERROR: pid 7202: new_connection: create_cp() failed
> >> >>>>>>> > 2012-09-24 10:55:34 LOG: pid 6724: wd_lifecheck: lifecheck failed 3
> >> >>>>>>> > times. pgpool seems not to be working
> >> >>>>>>> > 2012-09-24 10:55:34 LOG: pid 6724: wd_lifecheck: lifecheck failed 3
> >> >>>>>>> > times. pgpool seems not to be working
> >> >>>>>>> > 2012-09-24 10:55:34 ERROR: pid 7209: connect_inet_domain_socket:
> >> >>>>>>> > connect() failed: Connection refused
> >> >>>>>>> > 2012-09-24 10:55:34 ERROR: pid 7209: connection to cuda-db0(5432) failed
> >> >>>>>>> > 2012-09-24 10:55:34 ERROR: pid 7209: new_connection: create_cp() failed
> >> >>>>>>> > 2012-09-24 10:55:46 ERROR: pid 7213: connect_inet_domain_socket:
> >> >>>>>>> > connect() failed: Connection refused
> >> >>>>>>> > 2012-09-24 10:55:46 ERROR: pid 7213: connection to cuda-db0(5432) failed
> >> >>>>>>> > 2012-09-24 10:55:46 ERROR: pid 7213: new_connection: create_cp() failed
> >> >>>>>>> > 2012-09-24 10:55:46 LOG: pid 6724: wd_lifecheck: lifecheck failed 3
> >> >>>>>>> > times. pgpool seems not to be working
> >> >>>>>>> > 2012-09-24 10:55:46 LOG: pid 6724: wd_lifecheck: lifecheck failed 3
> >> >>>>>>> > times. pgpool seems not to be working
> >> >>>>>>> > 2012-09-24 10:55:46 ERROR: pid 7221: connect_inet_domain_socket:
> >> >>>>>>> > connect() failed: Connection refused
> >> >>>>>>> > 2012-09-24 10:55:46 ERROR: pid 7221: connection to cuda-db0(5432) failed
> >> >>>>>>> > 2012-09-24 10:55:46 ERROR: pid 7221: new_connection: create_cp() failed
> >> >>>>>>> > 2012-09-24 10:55:58 ERROR: pid 7223: connect_inet_domain_socket:
> >> >>>>>>> > connect() failed: Connection refused
> >> >>>>>>> > 2012-09-24 10:55:58 ERROR: pid 7223: connection to cuda-db0(5432) failed
> >> >>>>>>> > 2012-09-24 10:55:58 ERROR: pid 7223: new_connection: create_cp() failed
> >> >>>>>>> > 2012-09-24 10:55:58 LOG: pid 6724: wd_lifecheck: lifecheck failed 3
> >> >>>>>>> > times. pgpool seems not to be working
> >> >>>>>>> > 2012-09-24 10:55:58 LOG: pid 6724: wd_lifecheck: lifecheck failed 3
> >> >>>>>>> > times. pgpool seems not to be working
> >> >>>>>>> > 2012-09-24 10:55:58 ERROR: pid 7231: connect_inet_domain_socket:
> >> >>>>>>> > connect() failed: Connection refused
> >> >>>>>>> > 2012-09-24 10:55:58 ERROR: pid 7231: connection to cuda-db0(5432) failed
> >> >>>>>>> > 2012-09-24 10:55:58 ERROR: pid 7231: new_connection: create_cp() failed
> >> >>>>>>> > 2012-09-24 10:56:10 ERROR: pid 7233: connect_inet_domain_socket:
> >> >>>>>>> > connect() failed: Connection refused
> >> >>>>>>> > 2012-09-24 10:56:10 ERROR: pid 7233: connection to cuda-db0(5432) failed
> >> >>>>>>> > 2012-09-24 10:56:10 ERROR: pid 7233: new_connection: create_cp() failed
> >> >>>>>>> > 2012-09-24 10:56:10 LOG: pid 6724: wd_lifecheck: lifecheck failed 3
> >> >>>>>>> > times. pgpool seems not to be working
> >> >>>>>>> > 2012-09-24 10:56:10 LOG: pid 6724: wd_lifecheck: lifecheck failed 3
> >> >>>>>>> > times. pgpool seems not to be working
> >> >>>>>>> > 2012-09-24 10:56:10 ERROR: pid 7243: connect_inet_domain_socket:
> >> >>>>>>> > connect() failed: Connection refused
> >> >>>>>>> > 2012-09-24 10:56:10 ERROR: pid 7243: connection to cuda-db0(5432) failed
> >> >>>>>>> > 2012-09-24 10:56:10 ERROR: pid 7243: new_connection: create_cp() failed
> >> >>>>>>> > 2012-09-24 10:56:22 LOG: pid 6724: wd_escalation: escalated to master pgpool
> >> >>>>>>> > 2012-09-24 10:56:24 LOG: pid 6724: wd_escalation: escaleted to
> >> >>>>>>> > delegate_IP holder
> >> >>>>>>> > #########
> >> >>>>>>> >
> >> >>>>>>> > I'm not sure what sort of information is needed to debug what went
> >> >>>>>>> > wrong. Let me know if something else is needed, and I'll do my best
> >> >>>>>>> > to provide it. thanks
--
Yugo Nagata <nagata at sraoss.co.jp>
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