Re: Docker with data inside

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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


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