停止Moosefs服务

## 写一个脚本,卸载挂载:192.168.1.3,192.168.1.4,192.168.1.5 /mfsdata . 遇到target is busy强行停止 。逐一 停止moosefs服务，等前一个服务完全停止再开始停止下一个服务 
moosefs-master:192.168.1.211. 
moosefs-metalogger:192.168.1.212 ,
moosefs-chunkserver:192.168.1.3,192.168.1.5,192.168.1.214 
并关机
```
#!/bin/bash

# Define a function to stop a service and wait until it's completely stopped
stop_service() {
    if ! ssh "${username}@$1" "systemctl status $2 | grep -q 'Active: active (running)'"; then
        echo "Service '$2' is already stopped on $1"
        return
    fi

echo "Stopping service '$2' on $1..."
    ssh "${username}@$1" "systemctl stop $2"
    while ssh "${username}@$1" "systemctl status $2 | grep -q 'Active: active (running)'"; do
        echo "Waiting for service '$2' to stop on $1..."
        sleep 1
    done
}

# Define a function to unmount the specified directory and wait until it's completely unmounted
unmount_directory() {
    local machine="$1"
    local dir="$2"

# Find all processes using the directory and kill them
    while lsof "$dir" && fuser "$dir" >/dev/null; do
        echo "Some file in '$dir' is still in use. Killing all processes using it on $machine..."
        ssh "${username}@$machine" "fuser -km $dir"
        sleep 3
    done

# Unmount the directory and wait until it's unmounted
    echo "Trying to unmount '$dir' on $machine..."
    ssh "${username}@$machine" "umount -f $dir"
    while ssh "${username}@$machine" "mount | grep -qF '$dir'"; do
        echo "Waiting for '$dir' to be unmounted on $machine..."
        sleep 1
    done
}

# Define a function to run a command on all machines in parallel
run_command() {
    local command="$1"
    shift
    for host in "$@"; do
        ssh "${username}@$host" "$command" &
    done
    wait # Wait for all background processes to finish
}

# Set the variables
username="root"
master="192.168.1.211"
metalogger="192.168.1.212"
chunkservers=("192.168.1.3" "192.168.1.5" "192.168.1.214")
machines=("${chunkservers[@]}" "$master" "$metalogger")
directory="/mfsdata"

# Stop MooseFS services in order
echo "Stopping MooseFS services..."
stop_service "$master" "moosefs-master"
stop_service "$metalogger" "moosefs-metalogger"
for chunkserver in "${chunkservers[@]}"; do
    stop_service "$chunkserver" "moosefs-chunkserver"
done

# Unmount the directory on all machines
echo "Unmounting '$directory' on all machines..."
run_command "if mount | grep -qF '$directory'; then echo 'Unmounting $directory...'; umount -f '$directory'; fi" "${machines[@]}"

# Try to force-unmount the directory on all machines
echo "Trying to force-unmount '$directory' on all machines..."
run_command "if mount | grep -qF '$directory'; then echo 'Force-unmounting $directory...'; umount -f -l '$directory'; fi" "${machines[@]}"

# Power off all machines
echo "Shutting down all machines..."
for host in "${machines[@]}"; do
    ssh ${username}@$host "shutdown -h now" &
done

wait # Wait for all background processes to finish
echo "All machines have been shut down successfully."
```