Re: Docker with data inside

[Κοκμάδης Δημήτριος <dkokmadis@xxxxxxxxx>]

Hello,

The problem is that I am not able to set kernel parameters inside docker as it is running as readonly 

sysctl: setting key "kernel.sem": Read-only file system

Thanks,

Dimitris

2016-10-20 12:31 GMT+03:00 Achilleas Mantzios <achill@xxxxxxxxxxxxxxxxxxxxx>:

Καλημέρα Δημήτρη

On 20/10/2016 12:04, Κοκμάδης Δημήτριος wrote:

Hello,

I am trying to create a docker Postgres container with database inside. 

When I try to run the container I have the following error

2016-10-20 08:58:33 UTC  FATAL:  the database system is starting up

2016-10-20 08:58:33 UTC  DEBUG:  shmem_exit(1): 0 before_shmem_exit callbacks to make

2016-10-20 08:58:33 UTC  DEBUG:  shmem_exit(1): 0 on_shmem_exit callbacks to make

2016-10-20 08:58:33 UTC  DEBUG:  proc_exit(1): 1 callbacks to make

2016-10-20 08:58:33 UTC  DEBUG:  exit(1)

In IPC-enabled/compiled versions you might want to set some kernel tunables related to IPC :
sysctl -a | grep -e 'sem|shm'
and adjust accordingly.
It seems that your installation uses mmap so you gotta handle this error first :
"mmap with MAP_HUGETLB failed, huge pages disabled: Cannot allocate memory"

See some Docker info how to resolve this.

The entry point is

su -c "/usr/lib/postgresql/9.4/bin/postgres -d 3 -D /var/lib/postgresql/9.4/main -c config_file=/etc/postgresql/9.4/main/postgresql.conf" postgres

and the output of command

2016-10-20 08:56:58 UTC  DEBUG:  postgres: PostmasterMain: initial environment dump:

2016-10-20 08:56:58 UTC  DEBUG:  -----------------------------------------

2016-10-20 08:56:58 UTC  DEBUG:   HOSTNAME=c0e6a383b652

2016-10-20 08:56:58 UTC  DEBUG:   SHELL=/bin/bash

2016-10-20 08:56:58 UTC  DEBUG:   TERM=xterm

2016-10-20 08:56:58 UTC  DEBUG:   USER=postgres

2016-10-20 08:56:58 UTC  DEBUG:   MAIL=/var/mail/postgres

2016-10-20 08:56:58 UTC  DEBUG:   PATH=/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games

2016-10-20 08:56:58 UTC  DEBUG:   _=/usr/lib/postgresql/9.4/bin/postgres

2016-10-20 08:56:58 UTC  DEBUG:   PWD=/var/ansible

2016-10-20 08:56:58 UTC  DEBUG:   LANG=en_US.UTF-8

2016-10-20 08:56:58 UTC  DEBUG:   HOME=/var/lib/postgresql

2016-10-20 08:56:58 UTC  DEBUG:   SHLVL=2

2016-10-20 08:56:58 UTC  DEBUG:   LOGNAME=postgres

2016-10-20 08:56:58 UTC  DEBUG:   PGLOCALEDIR=/usr/share/locale

2016-10-20 08:56:58 UTC  DEBUG:   PGSYSCONFDIR=/etc/postgresql-common

2016-10-20 08:56:58 UTC  DEBUG:   LC_COLLATE=en_US.UTF-8

2016-10-20 08:56:58 UTC  DEBUG:   LC_CTYPE=en_US.UTF-8

2016-10-20 08:56:58 UTC  DEBUG:   LC_MESSAGES=en_US.UTF-8

2016-10-20 08:56:58 UTC  DEBUG:   LC_MONETARY=C

2016-10-20 08:56:58 UTC  DEBUG:   LC_NUMERIC=C

2016-10-20 08:56:58 UTC  DEBUG:   LC_TIME=C

2016-10-20 08:56:58 UTC  DEBUG:  -----------------------------------------

2016-10-20 08:56:58 UTC  DEBUG:  invoking IpcMemoryCreate(size=294363136)

2016-10-20 08:56:58 UTC  DEBUG:  mmap with MAP_HUGETLB failed, huge pages disabled: Cannot allocate memory

2016-10-20 08:56:58 UTC  DEBUG:  SlruScanDirectory invoking callback on pg_notify/0000

2016-10-20 08:56:58 UTC  DEBUG:  removing file "pg_notify/0000"

2016-10-20 08:56:58 UTC  DEBUG:  dynamic shared memory system will support 108 segments

2016-10-20 08:56:58 UTC  DEBUG:  created dynamic shared memory control segment 1804289383 (876 bytes)

2016-10-20 08:56:58 UTC  DEBUG:  max_safe_fds = 984, usable_fds = 1000, already_open = 6

2016-10-20 08:56:58 UTC  LOG:  redirecting log output to logging collector process

2016-10-20 08:56:58 UTC  HINT:  Future log output will appear in directory "/var/log/postgresql".

2016-10-20 09:00:41 UTC  DEBUG:  logger shutting down

2016-10-20 09:00:41 UTC  DEBUG:  shmem_exit(0): 0 before_shmem_exit callbacks to make

2016-10-20 09:00:41 UTC  DEBUG:  shmem_exit(0): 0 on_shmem_exit callbacks to make

2016-10-20 09:00:41 UTC  DEBUG:  proc_exit(0): 0 callbacks to make

2016-10-20 09:00:41 UTC  DEBUG:  exit(0)

2016-10-20 09:00:41 UTC  DEBUG:  shmem_exit(-1): 0 before_shmem_exit callbacks to make

2016-10-20 09:00:41 UTC  DEBUG:  shmem_exit(-1): 0 on_shmem_exit callbacks to make

2016-10-20 09:00:41 UTC  DEBUG:  proc_exit(-1): 0 callbacks to make

My configuration parameters are

data_directory = '/var/lib/postgresql/9.4/main' # use data in another directory

hba_file = '/etc/postgresql/9.4/main/pg_hba.conf' # host-based authentication file

ident_file = '/etc/postgresql/9.4/main/pg_ident.conf' # ident configuration file

external_pid_file = '/var/run/postgresql/9.4-main.pid' # write an extra PID file

listen_addresses = '0.0.0.0'

port = 5432 # (change requires restart)

max_connections = 10

unix_socket_directories = '/var/run/postgresql' # comma-separated list of directories

ssl = true # (change requires restart)

ssl_cert_file = '/etc/ssl/certs/ssl-cert-snakeoil.pem' # (change requires restart)

ssl_key_file = '/etc/ssl/private/ssl-cert-snakeoil.key' # (change requires restart)

shared_buffers = 256MB

work_mem = 256MB

maintenance_work_mem = 128MB

dynamic_shared_memory_type = posix # the default is the first option

wal_level = hot_standby

wal_buffers = 16MB

checkpoint_segments = 64

checkpoint_completion_target = 0.7

max_wal_senders = 6

wal_keep_segments = 8

effective_cache_size = 256MB

default_statistics_target = 100

logging_collector = on

log_directory = '/var/log/postgresql'

log_filename = 'postgresql-%Y-%m-%d.log'

log_rotation_age = 1d

log_min_duration_statement = 5000

log_line_prefix = '%t  '

log_timezone = 'localtime'

stats_temp_directory = '/var/run/postgresql/9.4-main.pg_stat_tmp'

log_autovacuum_min_duration = -1

autovacuum_max_workers = 3

autovacuum_naptime = 15min

autovacuum_vacuum_threshold = 50

autovacuum_analyze_threshold = 50

autovacuum = on

datestyle = 'iso, mdy'

timezone = 'UTC'

timezone = 'Europe/Athens'

client_encoding = UTF8

lc_messages = 'en_US.UTF-8' # locale for system error message

lc_monetary = 'en_US.UTF-8' # locale for monetary formatting

lc_numeric = 'en_US.UTF-8' # locale for number formatting

lc_time = 'en_US.UTF-8' # locale for time formatting

default_text_search_config = 'pg_catalog.english'

Thanks,

Dimitris

-- 
Achilleas Mantzios
IT DEV Lead
IT DEPT
Dynacom Tankers Mgmt