Verification of how to periodically execute a script on a Linux server on Windows

We verified whether the operation can be performed according to the title.

-Verification environment- Windows 10 2 virtualbox VMs (Centos7)

The setting will proceed in the reverse flow of the image. ① Target server ・ Install the shell script you want to process ・ Process to acquire the memory usage rate ② Jump server ・ Install expect and install shell script using its function) ③ Windows local PC ・ TeraTermMacro (created for ShellScript Kick of Jump server) ・ Windows bat ・ TaskManager periodic execution setting

1. Install Shellscript on Target server

Work target: Target server Purpose: Set up a shell script for the process you want to run (as a process to record memory usage)

$ cat memory-use-rate-check.sh
#!/bin/bash
# create file memory-use.log
if [[ ! -e /var/tmp/memory-use.log ]]; then
  touch /var/tmp/memory-use.log
  chmod 755 /var/tmp/memory-use.log
fi
# memory use rate check
MemTotal=`free | grep Mem: | awk -F " " '{print$2}'`
MemoFree=`free | grep Mem: | awk -F " " '{print$4}'`

MemUse=`expr $MemTotal - $MemoFree`
MemRate=`expr $MemUse "*" 100 / $MemTotal`

echo `date +%Y-%m-%d/%H:%M`　>> /var/tmp/memory-use.log
echo  "Memory Used Rate:" $MemRate"%"　>> /var/tmp/memory-use.log

Execution result: It's like recording the memory usage in a log file.

[vagrant@Target tmp]$ tail -n2 memory-use.log
2020-12-10/11:31　
Memory Used Rate: 16%　

2. Expect installation, shell script installation using that function.

Work target: Jump server Purpose: Remotely execute memory-use-rate-check.sh installed in 1 from the Jump server. 2-1. Install expect

[vagrant@Jump tmp]$ sudo yum install expect -y

2-2. Installed a shell script that uses the expect function (automates the dialogue response). Purpose: Kick memory-use-rate-check.sh of Jump → target.

[vagrant@Jump tmp]$ cat expect-for-target.sh
#!/bin/sh
expect -c "
set timeout 2
spawn env LANG=C /usr/bin/ssh [email protected]
expect \"password:\"
send \"vagrant\n\"
expect \"~]$\"
send \"cd /var/tmp\n\"
expect \"]$\"

send \"bash ./memory-use-rate-check.sh\n\"

expect \"tmp]$\"
exit 0
"
[vagrant@Jump tmp]$

3. Install local Windows PC Teraterm Macro

Work target: Local Windows PC Purpose: Kick expect-for-target.sh on Windows PC → Jump server

• Memo: This ttl (teraTermMacro) uses a method to encrypt and save the password.

Expect_test> type jump-expect-kick.Instead of the ttl ← cat command, use the type command to display the contents.

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
username = 'vagrant'
hostname = '192.168.18.20'
passwdfile = 'passwd.dat'
portnum = '22'
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
call login
call exec
call exit
end
:login
    getpassword passwdfile username userpasswd
    msg = hostname
    strconcat msg ':portnum /ssh /auth=password /user='
    strconcat msg username
    strconcat msg ' /passwd='
    strconcat msg userpasswd
    strconcat msg inputstr
    connect msg
return
:exec
    wait '$ '
    msg = 'cd '
    strconcat msg '/var/tmp'
    sendln msg

    wait ']$ '
    msg = 'bash ./expect-for-target.sh'
    sendln msg
    pause 8
return
:exit
    wait '$ '
    msg = 'exit'
    sendln msg

4. Set the task schedule in Windows Task Manager.

Work target: Windows PC

1. 1. Run the following at the command prompt 　　compmgmt.msc ⇒ Computer management starts.
2. 2. task Scheduler ⇒Open the task scheduler library. Right-click to open Create Task.
3. 3. Task settings

This completes.

-PS- I decided to join the Advent calendar in a hurry This is what I did recently in my drawer.