Re: Docker with data inside

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(at)matrix(dot)gatewaynet(dot)com>
:

> 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
>
>