如果停止，这是启动多个服务的更好方法

Question

我正在尝试将ssh放入多个aws节点，并在停止时启动一个服务（它包含一个服务列表）。以下是我尝试过的脚本，我对Shell脚本是完全陌生的，如果这是实现我要尝试的更好方法，请提出建议。

#!/bin/bash

service_1="service_1"
service_2="service_2"
service_3="service_3"
service_4="service_4"
service_5="service_5"
service_6="service_6"

check_service()
{
service_status=$(pgrep "$1" | wc -l)
if [ "$service_status" -ne 1 ]
then
 echo "starting service $1"
 "$1 start"
else
  echo "stopping service $1"
  "$1 stop"
fi
}

    # Reading the node.list line by line 
while read -r line
do
    {
    echo "running ssh on $line"
    # specify the directory of the pem file location
    ssh -i /directory/keyname.pem ec2-user@"$line"
# Passing the different service variables to check_service method 
check_service "$service_1"
check_service "$service_2"
check_service "$service_3"
check_service "$service_4"
check_service "$service_5"
check_service "$service_6"
 } < /dev/null
done < "node.list"