在新的 linux 服务器上恢复 postgresql 安装

Question

我不知道如何在新的 ubuntu 18.04 服务器上恢复 postgres 安装。我的旧 postgres 在 mnt 分区中。

我刚刚使用 postgresqp 11 全新安装配置了新的 ubuntu 18.04 服务器。现在，我想用我的旧 postgres（也是 11）指向 mnt 分区。我尝试使用路径"/mnt/postgresql/11/main" 更改默认目录的data_directory，但没有成功。有什么想法吗？

mnt 分区包含我所有的数据库和旧信息：

/mnt/postgresql/11/main$ ls -a

.           base          pg_dynshmem   pg_notify    pg_snapshots  pg_subtrans  pg_wal                postmaster.opts
..          global        pg_logical    pg_replslot  pg_stat       pg_tblspc    pg_xact
PG_VERSION  pg_commit_ts  pg_multixact  pg_serial    pg_stat_tmp   pg_twophase  postgresql.auto.conf

我的默认路径是：

/etc/postgresql/11/main$ ls
conf.d       pg_ctl.conf  pg_ident.conf    postgresql.conf.save    start.conf
environment  pg_hba.conf  postgresql.conf  postgresql.conf.save.1

而我实际的/etc/postgresql/11/main/postgresql.conf 是：

#------------------------------------------------------------------------------
# FILE LOCATIONS
#------------------------------------------------------------------------------

# The default values of these variables are driven from the -D command-line
# option or PGDATA environment variable, represented here as ConfigDir.

#data_directory = '/mnt/postgresql/11/main' '/var/lib/postgresql/11/main'
data_directory = '/mnt/postgresql/11/main'              # use data in another directory
                                        # (change requires restart)
hba_file = '/etc/postgresql/11/main/pg_hba.conf'        # host-based authentication file
                                        # (change requires restart)
ident_file = '/etc/postgresql/11/main/pg_ident.conf'    # ident configuration file
                                        # (change requires restart)

# If external_pid_file is not explicitly set, no extra PID file is written.
external_pid_file = '/var/run/postgresql/11-main.pid'                   # write an extra PID file
                                        # (change requires restart)


#------------------------------------------------------------------------------
# CONNECTIONS AND AUTHENTICATION
#------------------------------------------------------------------------------

# - Connection Settings -

listen_addresses = '*'                  # what IP address(es) to listen on;
                                        # comma-separated list of addresses;
                                        # defaults to 'localhost'; use '*' for all
                                        # (change requires restart)
port = 5432                             # (change requires restart)

我需要恢复所有 mnt 分区数据，但我不知道该怎么做。有什么帮助？？

当我重新启动 postgres 时给了我这个消息：

psql
psql: could not connect to server: No such file or directory
        Is the server running locally and accepting
        connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?

Answer 1

psql 是一个客户端实用程序，它不会启动 postgresql 服务。要在 Ubuntu 中启动 PostgreSQL，请使用 service 命令（必须是 root 或 sudo）：

sudo service postgresql start