捕获和邮寄的bash脚本错误 [英] Capturing and mailing bash script errors

问题描述

我有我的cron在夜间运行备份一些Postgres数据库用我的网络上的多个主机的脚本。我有越来越警觉，该脚本通过利用退出状态失败的一种方式，但它并没有告诉我为什么失败了。

根据折以下code，我怎么能捕捉到当脚本运行时出现的任何错误，并通过电子邮件发送给我，让我能有一个更好的了解所发生的事情。

  FILEDATE ='日期'+％Y-％M-％D'`
BASEDIR = / U1 / $ 1 / db_dumps
PGD​​UMP = /路径/要/ pg_dump的
HOST = $ 1
DB = $ 16如果[$ DB ==全部]
然后
    为DB1 DB2 DB3 ALLDUMPS
        做
        SSH根@ $ HOSTENV PGUSER = PGUSER PGPASSWORD = $ PGPASSWORD -Fc PGDUMP $ ALLDUMPS| pbzip2＆GT; $ BASEDIR / $ FILEDATE- $ HOST- $ ALLDUMPS.dump.bz2
            如果[$？ -ne 0]
                然后狗-sdbdumper无法创建$ ALLDUMP从$ HOST备份[e-mail]＆LT;的/ dev / null的
            科幻
        DONE其他
    SSH根@ $ HOSTENV PGUSER = PGUSER PGPASSWORD = $ PGPASSWORD -Fc PGDUMP $ DB| pbzip2＆GT; $ BASEDIR / $ FILEDATE- $ HOST- $ DB.dump.bz2
如果[$？ -ne 0]
    然后狗-sdbdumper无法创建$ DB从$ HOST备份[e-mail]＆LT;的/ dev / null的
科幻
科幻
 

解决方案

从SSH命令捕获标准错误，并通过电子邮件发送，为你自己。

 标准错误= $（SSH根@ $ HOSTENV PGUSER =用户PGPASSWORD = PW $ PGDUMP -Fc $ ALLDUMPS|
          pbzip2 2  - ;＆放大器1为卤素; $ BASEDIR / $ FILEDATE- $ HOST- $ ALLDUMPS.dump.bz2）
如果[$？ -ne 0];然后
   SUBJ =dbdumper无法创建$ ALLDUMP从$ HOST备份
   狗-s$ [e-mail]＆LT;＆LT;＆LT; $标准错误
科幻
 

I have a script that I run nightly in cron to backup some postgres databases for several hosts on my network. I have a way of getting alerted that the script fails by leveraging the exit status, but it doesn't tell me WHY it failed.

Based off the following code, how can I capture any errors that occur when the script is run, and email them to me so I can have a better understanding of what happened.

FILEDATE=`date '+%Y-%m-%d'`
BASEDIR=/u1/$1/db_dumps
PGDUMP=/path/to/pg_dump
HOST=$1
DB=$2

if [ $DB == all ]
then 
    for ALLDUMPS in db1 db2 db3
        do
        ssh root@$HOST "env PGUSER=pguser PGPASSWORD=pgpassword $PGDUMP -Fc $ALLDUMPS" | pbzip2 > $BASEDIR/$FILEDATE-$HOST-$ALLDUMPS.dump.bz2
            if [ $? -ne 0 ]
                then mutt -s "dbdumper could not create a backup of $ALLDUMP from $HOST" [e-mail] < /dev/null
            fi
        done

else 
    ssh root@$HOST "env PGUSER=pguser PGPASSWORD=pgpassword $PGDUMP -Fc $DB" | pbzip2 > $BASEDIR/$FILEDATE-$HOST-$DB.dump.bz2
if [ $? -ne 0 ]
    then mutt -s "dbdumper failed to create a backup of $DB from $HOST" [e-mail] < /dev/null
fi
fi

解决方案

Capture stderr from the ssh command, and email that to yourself.

stderr=$( ssh root@$HOST "env PGUSER=user PGPASSWORD=pw $PGDUMP -Fc $ALLDUMPS" | 
          pbzip2 2>&1 > "$BASEDIR/$FILEDATE-$HOST-$ALLDUMPS.dump.bz2" )
if [ $? -ne 0 ]; then
   subj="dbdumper could not create a backup of $ALLDUMP from $HOST"
   mutt -s "$subj" [e-mail] <<< "$stderr"
fi

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