1. 建立备份目录，设置所有者为postgres
2. 修改pgsql_backup.conf文件，设置需要备份的数据库的数据目录database，和备份目录backup
3. 修改数据库的配置文件postgresql.conf文件，修改archive_command = '/path/to/pgsql_backup.sh archive %p %f'
4. 以postgres用户身份建立定期任务，定期执行pgsql_backup.sh xlog
5. 执行pgsql_backup.sh base进行基础备份(之前，最好执行一次vacuumdb -afz)
6. 执行pgsql_backup.sh clean <timestamp>清除指定时间以前的备份数据
以下是备份脚本pgsql_backup.sh
#!/bin/bash# 备份Postgresql数据库# 支持以下命令: # base: 进行一个基础备份# archive: 归档数据库日志(用于设置postgresql.conf中的archive_command参数)# xlog: 复制当前部分填充的日志段# clean: 删除指定日期之前的备份数据##database=/raid/postgresql/8.1/main#backup=/data/backup/database. /etc/admin/pgsql_backup.confbase(){ local v=$(date "+%Y%m%d") local d="$backup/base/$v" mkdir -p "$d"# vacuumdb -afz psql template1 -c "select pg_start_backup('$v');" (cd "$database"; cp -a $(ls | sed 's/pg_xlog//') "$d") psql template1 -c "select pg_stop_backup();"}# archive_command = '/raid/bin/pgsql_backup.sh archive %p %f'archive(){ local p="$1" local f="$2" if [ "$p" = "" ] || [ "$f" = "" ] || [ -f "$backup/archive/$f" ]; then return 1 fi mkdir -p "$backup/archive" cp -a "$p" "$backup/archive/$f"}xlog(){ mkdir -p "$database/pg_xlog" rsync -a --delete "$database/pg_xlog" "$backup"}clean(){ local t=$(echo "$1" | grep -E '^[0-9]{4}-[0-9]{1,2}-[0-9]{1,2}$') if [ "$t" = "" ]; then echo "Timestamp '$1' error" return 1 fi touch -d "$t" "$backup/base/timestamp" echo -n "Clean archived logs before $(date -r "$backup/base/timestamp" +"%Y-%m-%d")? [y/N] " read a if [ "$a" != "y" ]; then return 1 fi echo "cleaning..." find $backup/archive -mindepth 1 -maxdepth 1 -not -newer $backup/base/timestamp -print -exec rm -rf {} /; find $backup/base -mindepth 1 -maxdepth 1 -not -newer $backup/base/timestamp -print -exec rm -rf {} /; echo "done."}case $1 in base) base ;; archive) archive "$2" "$3" ;; clean) clean "$2" ;; xlog) xlog ;; *) echo "usage: $0 {base|archive|xlog|clean}" exit 1 ;;esac
