linux安装postgresql数据库

本文提供数据库安装脚本，有部分需要优化，就是脚本中的方法执行存在前后依赖，但是代码里面没有对上一个执行结果进行判断，如果提供的路径和安装包没有问题，脚本能够正常执行

 #!/bin/bash
 # install postgre
 # base_path=$(cd $(dirname ${BASH_SOURCE[]}); pwd )
 base_path="/opt"
 # Pg database installation package name
 pg_name="./postgresql-9.6.15-1-linux-x64-binaries.tar.gz"
 # Pg database installation path
 pg_deploy_path="$base_path/postgreSQL"
 # Directory of data stored in the pg database
 pg_data_path="${pg_deploy_path}/data"
 # Directory of data stored in the pg database
 user_name='pguser'

 # unzip pg
 function pg_untar(){
     if [ -d ${pg_deploy_path} ];then
       echo "pg has been installed"
     else
       if [ ! -e ${pg_name} ];then
         echo "Missing pg installation package"
       else
          mkdir -p ${pg_deploy_path}
          tar -zxf ${pg_name} -C ${pg_deploy_path}
       fi
     fi
 }

 # Create a Linux user to log in to the PG database
 function pg_create_user(){
 #  user_exist=`cat /etc/passwd | grep '^${user_name}:' -c`
   egrep "^${user_name}" /etc/passwd >/dev/null
   if [ $? -eq  ]; then
     pass=$(perl -e 'print crypt($ARGV[0], "password")' $user_name)
     useradd -m -p $pass ${user_name}
     #useradd -m -p 'postgres' ${user_name}
     [ $? -eq  ] && echo "user [${user_name}] has been added to system!" || echo "Failed to add user [${user_name}]"
   else
     echo "user [${user_name}] exists"
   fi
 }

 #init pg
 function pg_init(){
     #Create a data directory
     mkdir -p ${pg_data_path}
     touch ${pg_deploy_path}/logfile
     #Grant user access
     chown -R ${user_name} ${pg_data_path}
     chown ${user_name} ${pg_deploy_path}/logfile

     # init database
     su - ${user_name} -c "${pg_deploy_path}/pgsql/bin/initdb -D ${pg_data_path}"
 }

 #Modify config of the pg database
 #
 function pg_modify_config(){
     id_path=${pg_data_path}/postgresql.conf
     local_path=${pg_data_path}/pg_hba.conf
     localip=$(/sbin/ifconfig -a|grep inet|grep -v 127.0.0.1|grep -v inet6|awk '{print $2}'|tr -d "addr:")
     if [ -d ${pg_data_path} ];then
       chown -R 'root' ${pg_data_path}
       #Modify listening ip
       sed -i "s@#listen_addresses = 'localhost'@listen_addresses = \'${localip}\'@g" $id_path
       #Modify Trust client ip
       #sed -i "s@#listen_addresses = 'localhost'@listen_addresses = \'${localip}\'@g" $id_path
       sed '86 ahost   all   all   0.0.0.0/0   trust' -i $local_path
       chown -R ${user_name} ${pg_data_path}
     else
       echo "You need to initialize the database with the command:\n\t  ${pg_deploy_path}/pgsql/bin/initdb -D ${pg_data_path} "
     fi
 }

 # start pg database
 function pg_start(){
  su - ${user_name} -c "${pg_deploy_path}/pgsql/bin/pg_ctl -D ${pg_data_path} -l ${pg_deploy_path}/logfile start"
 }
 # create default database bms_ops
 function pg_createdb(){
  sleep 3s
  default_db="bms_ops"
  su - ${user_name} -c "${pg_deploy_path}/pgsql/bin/createdb -O ${user_name} ${default_db}"
 }
 #Open  port
 function pg_open_port(){
   isopen=$(firewall-cmd --query-port=/tcp)
   if [ 'no' == $isopen ];then
    firewall-cmd --add-port=/tcp --permanent>/dev/null
    firewall-cmd --reload>/dev/null
   else
     echo "port 5432 already opened"
   fi

 }

 echo "============== start install pg =============="
 if [ -d ${pg_deploy_path} ];then
   echo "pg has been installed"
 else
   pg_untar
   pg_create_user
   pg_init
   pg_modify_config
   pg_start
   pg_createdb
   pg_open_port
 fi
 echo "============== finish installing pg =============="