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我想使用中提供的备份脚本（我的脚本与给定链接中的脚本相同，仅更改了配置）：

http://wiki.postgresql.org/wiki/Automated_Backup_on_Linux

在 pg_backup.config 我添加了：

BACKUP_USER = myusername (that has postgresql superuser access)
HOST = localhost
USERNAME = myusername (that has postgresql superuser access)

更新完整的 pg_backup.config：

##############################
## POSTGRESQL BACKUP CONFIG ##
##############################

# Optional system user to run backups as.  If the user the script is running as doesn't match this
# the script terminates.  Leave blank to skip check.
BACKUP_USER=myusername

# Optional hostname to adhere to pg_hba policies.  Will default to "localhost" if none specified.
HOSTNAME=localhost

# Optional username to connect to database as.  Will default to "postgres" if none specified.
USERNAME=myusername

# This dir will be created if it doesn't exist.  This must be writable by the user the script is
# running as.
BACKUP_DIR=/home/myusername/openerp/7.0/backup

# List of strings to match against in database name, separated by space or comma, for which we only
# wish to keep a backup of the schema, not the data. Any database names which contain any of these
# values will be considered candidates. (e.g. "system_log" will match "dev_system_log_2010-01")
SCHEMA_ONLY_LIST=""

# Will produce a custom-format backup if set to "yes"
ENABLE_CUSTOM_BACKUPS=no

# Will produce a gzipped plain-format backup if set to "yes"
ENABLE_PLAIN_BACKUPS=yes


#### SETTINGS FOR ROTATED BACKUPS ####

# Which day to take the weekly backup from (1-7 = Monday-Sunday)
DAY_OF_WEEK_TO_KEEP=5

# Number of days to keep daily backups
DAYS_TO_KEEP=7

# How many weeks to keep weekly backups
WEEKS_TO_KEEP=5

但是当我尝试使用命令运行 pg_backup.sh 时：

bash pg_backup.sh

我收到此错误消息：

Performing full backups
--------------------------------------------

psql: FATAL:  no pg_hba.conf entry for host "shows my external IP", user "postgres", database "postgres", SSL on
FATAL:  no pg_hba.conf entry for host "shows my external ip", user "postgres", database "postgres", SSL off

All database backups complete!

它还打印出所有数据库都是完整的，但它不做任何备份。

当我手动尝试此命令时：

pg_dump -Fp -h "localhost" -U "myusername" "mydatabase" | gzip > /home/myusername/openerp/7.0/backup/"mydatabase".sql.gz;

然后它会完美备份！

所以问题是为什么它会给出如此奇怪的错误？首先它使用我的外部 ip，当它应该使用 localhost，其次它连接到 postgres 用户（或者至少它显示像那样），当它应该连接到 myusername，第三，脚本错过了一些错误检查，因为它打印了所有数据库已成功备份，而实际上根本没有备份任何内容。

还查看脚本看起来它应该正确使用 pg_backup.config 中提供的所有内容，但它没有..

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