在我的代码中，我有以下运行远程脚本。
ssh root@host.domain.com "sh /home/user/backup_mysql.sh"
出于某种原因，它一直困扰着我 255。有什么想法吗？
我可以 SSH 到框中就好了（无密码密钥设置）
远程脚本:
MUSER='root'
MPASS='123123'
MHOST="127.0.0.1"
VERBOSE=0
### Set bins path ###
GZIP=/bin/gzip
MYSQL=/usr/bin/mysql
MYSQLDUMP=/usr/bin/mysqldump
RM=/bin/rm
MKDIR=/bin/mkdir
MYSQL=/usr/bin/mysqladmin
GREP=/bin/grep
### Setup dump directory ###
BAKRSNROOT=/.snapshots/tmp
#####################################
### ----[ No Editing below ]------###
#####################################
### Default time format ###
TIME_FORMAT='%H_%M_%S%P'
### Make a backup ###
backup_mysql_rsnapshot(){
local DBS="$($MYSQL -u $MUSER -h $MHOST -p$MPASS -Bse 'show databases')"
local db="";
[ ! -d $BAKRSNROOT ] && ${MKDIR} -p $BAKRSNROOT
${RM} -f $BAKRSNROOT/* >/dev/null 2>&1
# [ $VERBOSE -eq 1 ] && echo "*** Dumping MySQL Database ***"
# [ $VERBOSE -eq 1 ] && echo -n "Database> "
for db in $DBS
do
local tTime=$(date +"${TIME_FORMAT}")
local FILE="${BAKRSNROOT}/${db}.${tTime}.gz"
# [ $VERBOSE -eq 1 ] && echo -n "$db.."
${MYSQLDUMP} --single-transaction -u ${MUSER} -h ${MHOST} -p${MPASS} $db | ${GZIP} -9 > $FILE
done
# [ $VERBOSE -eq 1 ] && echo ""
# [ $VERBOSE -eq 1 ] && echo "*** Backup done [ files wrote to $BAKRSNROOT] ***"
}
### Die on demand with message ###
die(){
echo "$@"
exit 999
}
### Make sure bins exists.. else die
verify_bins(){
[ ! -x $GZIP ] && die "File $GZIP does not exists. Make sure correct path is set in $0."
[ ! -x $MYSQL ] && die "File $MYSQL does not exists. Make sure correct path is set in $0."
[ ! -x $MYSQLDUMP ] && die "File $MYSQLDUMP does not exists. Make sure correct path is set in $0."
[ ! -x $RM ] && die "File $RM does not exists. Make sure correct path is set in $0."
[ ! -x $MKDIR ] && die "File $MKDIR does not exists. Make sure correct path is set in $0."
[ ! -x $MYSQL ] && die "File $MYSQL does not exists. Make sure correct path is set in $0."
[ ! -x $GREP ] && die "File $GREP does not exists. Make sure correct path is set in $0."
}
### Make sure we can connect to server ... else die
verify_mysql_connection(){
$MYSQL -u $MUSER -h $MHOST -p$MPASS ping | $GREP 'alive'>/dev/null
[ $? -eq 0 ] || die "Error: Cannot connect to MySQL Server. Make sure username and password are set correctly in $0"
}
### main ####
verify_bins
verify_mysql_connection
backup_mysql_rsnapshot
46
这通常发生在远程关闭 / 不可用时;或者远程机器没有安装 ssh;或者防火墙不允许建立到远程主机的连接。
发生错误时，ssh返回 255，或者远程脚本返回 255：
EXIT STATUS
ssh exits with the exit status of the remote command or
with 255 if an error occurred.
通常你会收到类似的错误信息：
ssh: connect to host host.domain.com port 22: No route to host
或
ssh: connect to host HOSTNAME port 22: Connection refused
检查表：
如果直接从命令行运行 ssh 命令会发生什么？
你能ping那个机器吗？
远程安装了 ssh 吗？
如果已安装，那么 ssh 服务是否正在运行？
将 pdsh 用于“known_hosts”文件中未包含的主机时，也会发生此错误。
我能够通过手动 SSH 进入每个主机并接受“您要将其添加到已知主机”的问题来纠正这一点。
7
如果身份验证或连接有问题，例如无法从终端读取密码，ssh 将以 255 退出，而无法运行实际脚本。验证以确保可以运行“true”，以查看 ssh 连接是否成功建立。
是不是在线路的问题：
### Die on demand with message ###
die(){
echo "$@"
exit 999
}
如果我错了，请纠正我，但我相信退出 999 超出了退出代码的范围，并导致退出状态为 255。
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