【postgresql】 データベースクラスタの作成
環境
CentOS 6.5(64bit) PostgreSQL 9.3.5
そもそもPostgreSQLの"データベースクラスタ"とは??
1つのデータベースインスタンスが管理するデータベースの集合体。
複数の冗長化されたデータベースを一つのデータベースに仮想的に見せる、と言ったような意味で使われるクラスタとは意味が少し異なります。
マニュアル
postgres$ /usr/local/pgsql/bin/initdb -D /usr/local/pgsql/data
The "-D" option specifies the location where the data will be
stored. You can use any path you want, it does not have to be under
the installation directory. Just make sure that the server account
can write to the directory (or create it, if it doesn't already
exist) before starting "initdb", as illustrated here.
3. At this point, if you did not use the "initdb" -A option, you might
want to modify "pg_hba.conf" to control local access to the server
before you start it. The default is to trust all local users.
4. The previous "initdb" step should have told you how to start up the
database server. Do so now. The command should look something like:
/usr/local/pgsql/bin/postgres -D /usr/local/pgsql/data
This will start the server in the foreground. To put the server in
the background use something like:
nohup /usr/local/pgsql/bin/postgres -D /usr/local/pgsql/data \
</dev/null >>server.log 2>&1 </dev/null &
To stop a server running in the background you can type:
kill `cat /usr/local/pgsql/data/postmaster.pid`
コマンド
$ $PGHOME/bin/initdb -D [データベースクラスタ作成先]
実行ログ
[postgres@vagrant-centos65 ~]$ /usr/local/pgsql/bin/initdb -D /usr/local/pgsql/data/
The files belonging to this database system will be owned by user "postgres".
This user must also own the server process.
The database cluster will be initialized with locale "en_US.UTF-8".
The default database encoding has accordingly been set to "UTF8".
The default text search configuration will be set to "english".
Data page checksums are disabled.
fixing permissions on existing directory /usr/local/pgsql/data ... ok
creating subdirectories ... ok
selecting default max_connections ... 100
selecting default shared_buffers ... 128MB
creating configuration files ... ok
creating template1 database in /usr/local/pgsql/data/base/1 ... ok
initializing pg_authid ... ok
initializing dependencies ... ok
creating system views ... ok
loading system objects' descriptions ... ok
creating collations ... ok
creating conversions ... ok
creating dictionaries ... ok
setting privileges on built-in objects ... ok
creating information schema ... ok
loading PL/pgSQL server-side language ... ok
vacuuming database template1 ... ok
copying template1 to template0 ... ok
copying template1 to postgres ... ok
syncing data to disk ... ok
WARNING: enabling "trust" authentication for local connections
You can change this by editing pg_hba.conf or using the option -A, or
--auth-local and --auth-host, the next time you run initdb.
Success. You can now start the database server using:
/usr/local/pgsql/bin/postgres -D /usr/local/pgsql/data/
or
/usr/local/pgsql/bin/pg_ctl -D /usr/local/pgsql/data/ -l logfile start
[postgres@vagrant-centos65 ~]$
データベースクラスタ構成
[postgres@vagrant-centos65 ~]$ ll /usr/local/pgsql/data/ total 92 drwx------ 5 postgres postgres 4096 May 1 08:59 base drwx------ 2 postgres postgres 4096 May 1 08:59 global drwx------ 2 postgres postgres 4096 May 1 08:59 pg_clog -rw------- 1 postgres postgres 4476 May 1 08:59 pg_hba.conf -rw------- 1 postgres postgres 1636 May 1 08:59 pg_ident.conf drwx------ 4 postgres postgres 4096 May 1 08:59 pg_multixact drwx------ 2 postgres postgres 4096 May 1 08:59 pg_notify drwx------ 2 postgres postgres 4096 May 1 08:59 pg_serial drwx------ 2 postgres postgres 4096 May 1 08:59 pg_snapshots drwx------ 2 postgres postgres 4096 May 1 08:59 pg_stat drwx------ 2 postgres postgres 4096 May 1 08:59 pg_stat_tmp drwx------ 2 postgres postgres 4096 May 1 08:59 pg_subtrans drwx------ 2 postgres postgres 4096 May 1 08:59 pg_tblspc drwx------ 2 postgres postgres 4096 May 1 08:59 pg_twophase -rw------- 1 postgres postgres 4 May 1 08:59 PG_VERSION drwx------ 3 postgres postgres 4096 May 1 08:59 pg_xlog -rw------- 1 postgres postgres 20547 May 1 08:59 postgresql.conf
