joppot

The program absolutely runs in copy paste

Server

Monitor the memory state of ec2 with watch and free command

投稿日:2017年3月21日 更新日:

Pocket


Abstract

Hello everyone, It’s candle.
In this time, I will show you how to monitor ec2 memory in real time.
EC2 server of t2.micro has only 1GB of memory, If you run composer, rails, mysql on it, memory may be barely.
It is useful if you can monitor the memory and tune the server.


Precondition

EC2 server

SPONSORED LINK


free command to monitor memory

The command to display the current memory status is “free”.
Let’s run it.

free

Total memory 1GB, you can see that 300MB is used.
With the free command only, you can’t keep monitoring the memory status.

Combine with watch command

The watch command is generally used as follows.

watch -n “time span” “command to repeat”

For example, you want to run free command each one second.

watch -n 1 free

Watching for a while, the value of “used” and “free” will change.
If you stop the process, type “ctrl + c”.

The -d flag to color the changed place is also useful.

watch -n 1 -d free



making a function.

Open the .bash_profile and write next code.

function lf(){
  watch -n 1 -d free
}

Save it, reload .bash_profile.

source ~/.bash_profile

Run lf command, you can monitor memory.

lf



Conclusion

It can be used in various situations of the server.

スポンサードリンク

If you think this article is good, share it please

-Server
-

執筆者:


comment

Your email address will not be published. Required fields are marked *

関連記事

How to get nginx error.log and access.log with td-agent

English 日本語 Abstract Hello everyone, It’s candle. In this time, we collect nginx log with td-agent. I explain with td-agent, but basic configuration is similer with fluentd. Precondition Td-agent or fluentd is installed You have a nginx server.

Collect Rails 5 production.log with td-agent

English 日本語 Abstract Hello everybody It’s me candle. In this article I will show you how to collect rails 5 production.log with td-agent. Rails 5 was changed log format and it cause some problem. I will solve it and explain. relational article If you are using rails 4 please refer to the following article. td-agentでRails 4のproduction.logを取得する Precondition You can work ruby on rails in production mode Before read this article you setup the rails production environment such as webrick, apache, puma and nginx. You already installed td-agent or fluentd. You need td-agent or fluentd. It is installed on the ruby …

Setup of td-agent-ui and operation check

English 日本語 Abstract Hello everyone, It’s candle. In this time, I will show you how to set up td-agent-ui and operation check. Td-agent is easier than fluentd to operate on the server. Precondition Td-agent is installed Please refer to the following article when building td-agent to Centos 6.5. Build up a td-agent server on centos 6.5 For EC2, here Build up td-agent server on the EC2 of aws

Build up a td-agent server on centos 6.5

English 日本語 Abstract Hello everyone, It’s candle. In this time, we build up a td-agent server on the centos 6.5. Td-agent is service based on fluentd. It daemonizes fluentd and creates a GUI. Premise You have Centos 6.5 server. I use Centos 6.5 on the vagrant for explanation.

Build up td-agent server on the EC2 of aws

English 日本語 Abstract Hello everyone, It’s candle. In this time we will build up td-agent environment on the ec2. Precondition You have a EC2.

Profile


I work in the venture company as a CTO. I start to write program in University, first I learned java, C++ and PHP. In the company, I'm developing web services by Rails. I do like to automation.

スポンサードリンク

Archives