[Pgpool-general] psql: server closed the connection unexpectedly

[Ger Apeldoorn]

It is absolutely better to run pgpool as postgres, no doubt about it. :)

I've taken a look at the pg_hba.conf files of the servers and they 
generally trust anything that comes from the pgpool ip. I ran pgpool as 
root again to rule out that running it as postgres is not causing the 
problem.
The errors are still appearing in the logs when pgpool runs as root, so 
something else is going on.
On the other node it is running as postgres without any problems.

Here is the relevant section of pg_hba.conf on db3:
--------------------%<--------------------
# TYPE  DATABASE    USER        CIDR-ADDRESS          METHOD

# "local" is for Unix domain socket connections only
local   all         all                               trust
# IPv4 local connections:
host    all         all         127.0.0.1/32          trust
hostnossl    all         all         ip-from-db2/32      trust
hostnossl    all         all         ip-from-db3/32      trust
# IPv6 local connections:
host    all         all         ::1/128               trust
--------------------%<--------------------

This is pgpool.conf on db3:
--------------------%<--------------------
listen_addresses = '*'

# Port number for pgpool
port = 9999

# Port number for pgpool communication manager
pcp_port = 9898

# Unix domain socket path.  (The Debian package defaults to
# /var/run/postgresql.)
socket_dir = '/tmp'

# Unix domain socket path for pgpool communication manager.
# (Debian package defaults to /var/run/postgresql)
pcp_socket_dir = '/tmp'

# Unix domain socket path for the backend. Debian package defaults to 
/var/run/postgresql!
backend_socket_dir = '/tmp'

# pgpool communication manager timeout. 0 means no timeout, but strongly 
not recommended!
pcp_timeout = 10

# number of pre-forked child process
num_init_children = 256

# Number of connection pools allowed for a child process
max_pool = 128

# If idle for this many seconds, child exits.  0 means no timeout.
child_life_time = 300

# If idle for this many seconds, connection to PostgreSQL closes.
# 0 means no timeout.
connection_life_time = 60

# If child_max_connections connections were received, child exits.
# 0 means no exit.
child_max_connections = 0

# If client_idle_limit is n (n > 0), the client is forced to be
# disconnected whenever after n seconds idle (even inside an explicit
# transactions!)
# 0 means no disconnect.
client_idle_limit = 0

# Maximum time in seconds to complete client authentication.
# 0 means no timeout.
authentication_timeout = 60

# Logging directory
logdir = '/tmp'

# pid file name
pid_file_name = '/var/run/pgpool/pgpool.pid'

# Replication mode
replication_mode = true

# Load balancing mode, i.e., all SELECTs are load balanced.
# This is ignored if replication_mode is false.
load_balance_mode = true

# if there's a data mismatch between master and secondary
# start degeneration to stop replication mode
replication_stop_on_mismatch = true

# If true, replicate SELECT statement when load balancing is disabled.
# If false, it is only sent to the master node.
replicate_select = false

# Semicolon separated list of queries to be issued at the end of a session
reset_query_list = 'ABORT; DISCARD ALL'

# If true print timestamp on each log line.
print_timestamp = true

# If true, operate in master/slave mode.
master_slave_mode = false

# If true, cache connection pool.
connection_cache = true

# Health check timeout.  0 means no timeout.
health_check_timeout = 20

# Health check period.  0 means no health check.
health_check_period = 0

# Health check user
health_check_user = 'postgres'

# Execute command by failover.
# special values:  %d = node id
#                  %h = host name
#                  %p = port number
#                  %D = database cluster path
#                  %m = new master node id
#                  %M = old master node id
#                  %% = '%' character
#
failover_command = ''

# Execute command by failback.
# special values:  %d = node id
#                  %h = host name
#                  %p = port number
#                  %D = database cluster path
#                  %m = new master node id
#                  %M = old master node id
#                  %% = '%' character
#
failback_command = ''

# If true, automatically lock table with INSERT statements to keep SERIAL
# data consistency.  An /*INSERT LOCK*/ comment has the same effect.  A
# /NO INSERT LOCK*/ comment disables the effect.
insert_lock = false

# If true, ignore leading white spaces of each query while pgpool judges
# whether the query is a SELECT so that it can be load balanced.  This
# is useful for certain APIs such as DBI/DBD which is known to adding an
# extra leading white space.
ignore_leading_white_space = true

# If true, print all statements to the log.  Like the log_statement option
# to PostgreSQL, this allows for observing queries without engaging in full
# debugging.
log_statement = false

# If true, incoming connections will be printed to the log.
log_connections = false

# If true, hostname will be shown in ps status. Also shown in
# connection log if log_connections = true.
# Be warned that this feature will add overhead to look up hostname.
log_hostname = false

# if non 0, run in parallel query mode
parallel_mode = false

# if non 0, use query cache
enable_query_cache = false

#set pgpool2 hostname
pgpool2_hostname = ''

# system DB info
system_db_hostname = 'localhost'
system_db_port = 5433
system_db_dbname = 'pgpool'
system_db_schema = 'pgpool_catalog'
system_db_user = 'pgpool'
system_db_password = ''

# backend_hostname, backend_port, backend_weight
# here are examples
backend_hostname0 = 'db2'
backend_port0 = 5433
backend_weight0 = 1
backend_data_directory0 = '/data/postgres/data'
backend_hostname1 = 'db3'
backend_port1 = 5433
backend_weight1 = 1
backend_data_directory1 = '/data/postgres/data'

# - HBA -

# If true, use pool_hba.conf for client authentication. In pgpool-II
# 1.1, the default value is false. The default value will be true in
# 1.2.
enable_pool_hba = false

# - online recovery -
# online recovery user
recovery_user = 'postgres'

# online recovery password
recovery_password = ''

# execute a command in first stage.
recovery_1st_stage_command = 'pgpool_base_backup'

# execute a command in second stage.
recovery_2nd_stage_command = 'pgpool_recovery_pitr'

# maximum time in seconds to wait for remote start-up. 0 means no wait
recovery_timeout = 90

# If client_idle_limit_in_recovery is n (n > 0), the client is forced
# to be disconnected whenever after n seconds idle (even inside an
# explicit transactions!)  0 means no disconnect. This parameter only
# takes effect in recovery 2nd stage.
client_idle_limit_in_recovery = 0
--------------------%<--------------------

Your help is greatly appreciated!

Thanks again,
Ger.

Jaume Sabater wrote:
> On Mon, Jan 18, 2010 at 11:25 AM, Ger Apeldoorn <ger.apeldoorn at sara.nl> wrote:
>
>   
>> Ah, authentication.. I have noticed that the previous PGPOOL package ran
>> as root, and this one as postgres. Perhaps that messes up the
>> authentication.
>>
>> I'll look into it and will get back to you, thanks!
>>     
>
> That would definitely make a difference in your pg_hba.conf file.
> Needless to say that it's good to run it as postres user instead of
> root ;-)
>
>