bash

im9ewurl 于 2021-06-03 发布在 Hadoop

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我有以下几点 bash 脚本：


# !/bin/bash

cat /etc/hadoop/conf.my_cluster/slaves | \
while read CMD; do
    ssh -o StrictHostKeyChecking=no ubuntu@$CMD "sudo service hadoop-0.20-mapreduce-tasktracker restart"
    ssh -o StrictHostKeyChecking=no ubuntu@$CMD "sudo service hadoop-hdfs-datanode restart"
    echo $CMD
done
``` `/etc/hadoop/conf.my_cluster/slaves` 拥有5台从机的ip。这个 `datanode` 无法与服务器通信 `jobtracker` ，所以解决方法是重新启动它。输出为：

ubuntu@domU-12-31-39-07-D6-DE:~$ ./test.sh
Warning: Permanently added '54.211.5.233' (ECDSA) to the list of known hosts.

Stopping Hadoop tasktracker:
stopping tasktracker
Starting Hadoop tasktracker:
starting tasktracker, logging to /var/log/hadoop-0.20-mapreduce/hadoop-hadoop-tasktracker-domU-12-31-39-06-8A-27.out
Warning: Permanently added '54.211.5.233' (ECDSA) to the list of known hosts.
Stopping Hadoop datanode:
stopping datanode
Starting Hadoop datanode:
starting datanode, logging to /var/log/hadoop-hdfs/hadoop-hdfs-datanode-domU-12-31-39-06-8A-27.out
54.211.5.233

但是，在它应该运行的5个ip地址中，只有第一个被执行。我怎样才能解决这个问题？

hadoop bash

来源：https://stackoverflow.com/questions/24468568/loop-script-executing-only-once-bash

1条答案

按热度按时间

rxztt3cl1#

让我们问问shellcheck：

$ shellcheck yourscript

In yourscript line 3:
while read CMD; do
^-- SC2095: ssh may swallow stdin, preventing this loop from working properly.

In yourscript line 4:
    ssh -o StrictHostKeyChecking=no ubuntu@$CMD [...]
    ^-- SC2095: Add < /dev/null to prevent ssh from swallowing stdin.

就这样。

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