[pgpool-general: 1081] Re: watchdog enabled delegate_IP on multiple nodes simultaneously
Lonni J Friedman
netllama at gmail.com
Fri Oct 12 00:34:03 JST 2012
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
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