bash script for executing commands on multiple ser

问题:

I want a script which will restart the defined services on their respective servers. I want to pass parameter as below to the script: eg:

sh execute.sh 
Enter your server and service list: [server1:nginx,mysql],[server2:mysql,apache],[server3:mongodb,apache]

By this input the script should verify and start the services on the respective servers. I am able to do this on a single server by declaring variables.

#!/bin/bash

Instance_Name=server1
Service_Name=(nginx php-fpm mysql)
SSH_USER=admin
SSH_IDENT_FILE=~/credentials/user.pem

len=${#Service_Name[*]} 
i=0
while [ $i -lt $len ]; do 
service=${Service_Name[$i]}
ssh -i $SSH_IDENT_FILE -o StrictHostKeyChecking=no $SSH_USER@$Instance_Name 'service $service restart'
done

Now I don't have an idea to move forward. Please let me know if my question is unclear. Thanks in advance.

回答1:

Parse your input parameters

# create an array of server:services
a=($(echo "$1" | gawk 'BEGIN { FS="[]],[[]" } ; { print $1, $2, $3 }' | tr -d '[]'))
# add a for loop here to iterate values in array with code below
for var in "${a[@]}" ; do
  # get server name
  server1=$(echo $var | cut -d ':' -f1)
  # get your services as space separated
  servs1="$(echo $var | cut -d ':' -f2 | tr ',' ' ')"
  # loop your services
  for s in $servs1; do
    ssh $server1 "service $s restart"
  done
done

If you like bash programming or have to learn it this is the 'bible' to me Advanced Bash-Scripting Guide An in-depth exploration of the art of shell scripting Mendel Cooper http://www.tldp.org/LDP/abs/html/

回答2:

Try this?

#!/bin/bash
SSH_IDENT_FILE=~/credentials/user.pem
SSH_USER=admin

# tells 'for' to read "per line"
IFS='
'

for line in $(
# read input from 1st command-line arg (not stdin)
echo "$1"|\
# remove all services except (nginx php-fpm mysql)
sed 's/\([:,]\)\(\(nginx\|php-fpm\|mysql\)\|[^]:,[]\+\)/\1\3/g'|\
# make it multi-line:
#    server1 svc1 svc2
#    server2 svc1
sed 's/\[[^]:]*:,*\]//g;s/\],*$//;s/\],*/\n/g;s/[:,]\+/ /g;s/\[//g'|\
# make it single-param:
#    server1 svc1
#    server1 svc2
#    server2 svc1
awk '{for(i=2;i<=NF;i++)print $1" "$i}'
);do
        IFS=' ' read Instance_Name service <<< $line
        echo ssh -i $SSH_IDENT_FILE -o StrictHostKeyChecking=no $SSH_USER@$Instance_Name "service $service restart"
done