Amazon Server blog

I continue to write articles about Amazon Services and servers here: Amazon Server

Convert image to base64

It is extremely simple, and  without server-side:

<script>
    function convertToBase64(event) {
        var file = event.target.files[0];
        var reader = new FileReader();
        reader.onload = function (event) {
            document.getElementById('text').value = event.target.result;
            document.getElementById('text').select();
        };
        reader.readAsDataURL(file);
    }
</script>

<input id="file" type="file" onchange="convertToBase64(event)">
<textarea id="text"> </textarea>

You may use it at: ImageToBase64 or directly from here:


See this project on GitHub

Merge log files from multiple servers

If you have some similar servers (e.g. balanced EC2-instances) and need to analyze log files from them - it is possible to automatize downloading and merging all these files via shell script like this:

#!/bin/bash

LOG_DIR=log-`date +%Y.%m.%d_%H.%M.%S`

mkdir -p $LOG_DIR

scp -C ec2-user@node1.server.com:/log/file.log $LOG_DIR/file1.log
scp -C ec2-user@node2.server.com:/log/file.log $LOG_DIR/file2.log
scp -C ec2-user@node3.server.com:/log/file.log $LOG_DIR/file3.log

cat $LOG_DIR/*.log | sort >$LOG_DIR/files.log

Also it is a good idea to use ssh-agent to keep private keys.