redhat6.5安装postgresql8.4数据库

[b]Redhat6.5安装postgresql8.4数据库[/b]

[b]step1 先移除原有的postgresql数据库（如果有），否则直接跳过[/b]

rpm -qa | grep postgresql*

rpm -ev rpmName

[b]step2 下载新的postgresql rpm安装包[/b]
网址：http://mirrors.sohu.com/centos/6.6/os/x86_64/Packages/
wget http://mirrors.sohu.com/centos/6.6/os/x86_64/Packages/postgresql-libs-8.4.20-1.el6_5.x86_64.rpm
wget http://mirrors.sohu.com/centos/6.6/os/x86_64/Packages/postgresql-8.4.20-1.el6_5.x86_64.rpm
wget http://mirrors.sohu.com/centos/6.6/os/x86_64/Packages/postgresql-devel-8.4.20-1.el6_5.x86_64.rpm
wget http://mirrors.sohu.com/centos/6.6/os/x86_64/Packages/postgresql-server-8.4.20-1.el6_5.x86_64.rpm
下载完成后，按照下载顺序依次安装

rpm -ivh postgresql-libs-8.4.20-1.el6_5.x86_64.rpm

rpm -ivh postgresql-8.4.20-1.el6_5.x86_64.rpm

rpm -ivh postgresql-devel-8.4.20-1.el6_5.x86_64.rpm

rpm -ivh postgresql-server-8.4.20-1.el6_5.x86_64.rpm

[b]step3 初始化后启动数据库服务[/b]

初始化数据库，默认路径为/var/lib/pgsql/data

# service postgresql initdb

启动服务

# service postgresql start

step4 创建数据库

重建一个新os用户:

useradd postgresql

passwd postgresql

创建数据库

createdb proj2

对于错误

createdb: could not connect to database postgres: FATAL: Ident authentication failed for user "postgresql"

解决办法：

修改/var/lib/pgsql/data/pg_hga.conf文件

修改

# "local" is for Unix domain socket connections only
local all all ident

为：

# "local" is for Unix domain socket connections only
local all postgresql trust

保存，然后

重新加载配置文件

/etc/init.d/postgresql reload

对于错误：

createdb: could not connect to database postgres: FATAL: role "postgresql" does not exist

解决办法：

加参数-U指定具体的role

#postgres应该是postgresql中的默认的role

createdb proj2 -U postgres

连接到数据库

psql proj2 -U postgres

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