[pgpool-general: 1060] Re: watchdog enabled delegate_IP on multiple nodes simultaneously
Lonni J Friedman
netllama at gmail.com
Mon Oct 1 23:10:18 JST 2012
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
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