PostgreSQL 数据库备份为空——怎么了？

Question

我想配置 Alfresco 数据库 (PostgreSQL rdbms) 的备份。

为此我有一个这样的脚本：

psql-create-backup:

#!/bin/sh
pg_dump -h localhost -U postgres -Fc -Z9 -c -f /home/bykovan/alfresco-data-backup/"`date +%d-%m-%Y`".alfresco.backup alfresco

我保存在/home/bykovan，并赋予执行权限：

[bykovan@docflow ~]$ sudo chmod 711 psql-create-backup

然后我将作业添加到 cron:

[bykovan@docflow ~]$ sudo crontab -e
...

0 0 * * * /home/bykovan/psql-create-backup

在 pg_hba.conf 我添加了这一行 host all all 127.0.0.1/32 trust:

[bykovan@docflow ~]$ sudo vi /var/lib/pgsql/9.5/data/pg_hba.conf

-- SKIPPED --


# TYPE  DATABASE        USER            ADDRESS                 METHOD

# "local" is for Unix domain socket connections only
#local   all             all                                     peer
local   all             all                                     md5
# IPv4 local connections:
#host    all             all             127.0.0.1/32            ident
host     all             all             127.0.0.1/32            trust
host     all             all             127.0.0.1/32            md5
# IPv6 local connections:
#host    all             all             ::1/128                 ident
# Allow replication connections from localhost, by a user with the
# replication privilege.
#local   replication     postgres                                peer
#host    replication     postgres        127.0.0.1/32            ident
#host    replication     postgres        ::1/128                 ident

host    all             all             192.168.0.0/16            md5
-- VISUAL BLOCK --

备份为空：

[bykovan@docflow alfresco-data-backup]$ ls -lh

-rw-r--r-- 1 root root 0 feb 18 00:00 18-02-2017.alfresco.backup
-rw-r--r-- 1 root root 0 feb 19 00:00 19-02-2017.alfresco.backup
-rw-r--r-- 1 root root 0 feb 20 00:00 20-02-2017.alfresco.backup
-rw-r--r-- 1 root root 0 feb 21 00:00 21-02-2017.alfresco.backup

在 pg_hba.conf 我添加了这行：

host    all  all       ::1/128      md5
host    all  postgres  127.0.0.1/32 trust

然后重启服务：

[bykovan@docflow ~]$ sudo service postgresql-9.5 stop
Redirecting to /bin/systemctl stop  postgresql-9.5.service
[bykovan@docflow ~]$ sudo service postgresql-9.5 start
Redirecting to /bin/systemctl start  postgresql-9.5.service

然后在提示中直接运行命令（我被提示输入密码）并看到以下内容：

[bykovan@docflow alfresco-data-backup]$ ls -lh

-rw-r--r-- 1 root root    0 feb 17 18:39 17-02-2017.alfresco.backup
-rw-r--r-- 1 root root    0 feb 18 00:00 18-02-2017.alfresco.backup
-rw-r--r-- 1 root root    0 feb 19 00:00 19-02-2017.alfresco.backup
-rw-r--r-- 1 root root    0 feb 20 00:00 20-02-2017.alfresco.backup
-rw-r--r-- 1 root root    0 feb 21 19:41 21-02-2017.alfresco.backup
-rw-r--r-- 1 root root 667K feb 22 07:04 22-02-2017.alfresco.backup

但是运行通过 cron 的任务给了我空文件...

我哪里错了？

Answer 1

我在脚本中设置了密码，现在看起来是这样的：

PGPASSWORD="some_password" pg_dump -h localhost -U postgres -Fc -Z9 -c -f /home/bykovan/alfresco-data-backup/"`date +%d-%m-%Y`".alfresco.backup alfresco

现在一切正常。

PostgreSQL 数据库备份为空——怎么了？

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