Eagle eye on CPU usage

How to monitor CPU usage and server load.

In shared hosting or cloud hosting monitoring CPU usage and high load is essential part.

What is server load and when it shall considered as overloaded ?

Server could get overload because of excessive usage of CPU / Disk and RAM. We will learn how to monitor and know there is high CPU usage on server. Generally server load upto 1 for a single CPU server indicates very stable server. Server load upto 5 means it is bit overload but still nothing to worry but above 5 there is something wrong and user need to watch server load closely.

Commands to check server load.

1: w

2:uptime

3: top -d2

If user have server with multiple CPUs then normal server load range would vary for him accordingly. Like for server with 4 CPUs very stable server load is 4 and upto 16 server bit overloaded and above 16 user need to take care of CPU usage. Another important factor should be considered while monitoring server load is CPU %idle.

 

Administrator shall check CPU %idle if it is more than 30% then it can sit and allow to run processes/applications on server without worrying about server load. If it is less than 30% then services/application running on server will become less responsive and that time he need find and fix processes causing high CPU usage.

How to check %idle CPU ?

use command sar -u 1 1 this will show you present status of idle CPU in following example it is 85% which means server is stable and all applications running on server and responding quickly.

To check historical CPU idle% use command sar -u . Below is script which you can add in cronjob to monitor idle CPU usage. This script will monitor average “idle CPU” for 3 mins. If it get less than 30% then it will send an email to you. I recommend to set cron job every after 10 mins.

——————-

sar -u 10 3 | grep Average | awk '{print $NF}' > idlecpu
idlecpu=`cat idlecpu | cut -d. -f1`
echo $idlecpu
critical=30
if test $idlecpu -lt $critical
then
echo "CPU usage is high"
echo "Idle CPU is $idlecpu, this is critical. Timestamp `date` " | mail -s "Idle CPU % is less than 30" admin@midnight-cafe.com
else
if test $idlecpu -gt $critical
then
echo "CPU usage is okay"
else
echo "CPU usage is high"
echo "Idle CPU is $idlecpu, this is critical. Timestamp `date` " | mail -s "Idle CPU % is less than 30" admin@midnight-cafe.com
fi
fi
rm -f /home/idlecpu

——————-

Transfer Website from Weebly to WordPress

How to transfer a website from weebly to wordpress ?

Weebly is web designer software which make easy to design web site using weebly. But many advance web developer use wordpress CMS which provide more access to internal code. This is main reason people need to migrate site from weebly to wordpress.

But weebly doesn’t provide feature to export web site. There is a 3rd party tool named as WPBeginner weebly to wordpress site. We will learn in detail how to migrate using this tool.

Install WordPress

Setup new hosting account with your domain name (which is being used by weebly application). In order to install wordpress on the domain you don’t need to point dns of the domain to new hosting account. Instead just edit host file of your local PC and on last line add IP and domain in following format

IP-address-here yoursitename.com

This will point yoursitename.com to new IP (IP of new hosting account). Now install wordpress , and configure it like setting up theme, install required plugins for backup, security etc..and modify primary menu according to your original site requirement.

Migrate Content

Now we are ready to migrate data from weebly site to new wordpress site.

1: Visit url WeeblytoWP.com.

2: Insert your Weebly website URL (starting with HTTP:// or HTTPS://), name, and email account before clicking Export my Weebly Website.

3: Save the Export file.

4: In WordPress, after downloading your Weebly export file, select Tools and Import.

5: Select WordPress to install and activate the WordPress Import Plugin.

6: Select Run Importer at the top of the screen.

7: Browse for your RSS file before selecting Upload file and import.

8: Make any preferred changes on the Import Settings and assign an author to the imported posts. You can create an author or use an existing user.

The imported content should now show in their respective sections in WordPress.

Import Content Manually.

Many text and contents will not available in export file which will need to be copy manually. ie. Create page / post on your wordpress site and then copy text from weebly to wordpress pages/post and publish them.

Now time to Import images.

We recommend to use WordPress plugin. such as Save & Import Image from URL to import directly from Weebly. 

The easiest way to get an image URL:

For browser like Google Chrome: Right-click the image and select Open image in a new tab.

Fix Permalinks:

Now setting up Permalinks so that format of url’s of old website should match to new site’s url so that your user will not get 404 error while accessing urls using bookmarks. Also you will not need to submit urls for indexing. It can be set from WordPress > Wp-admin > Setting > Permalinks

rsync to copy difference

Rsync to copy difference of source and destination.

We use rsync command to copy files from source to destination. Rsync command sync modified/update files and newly created files on destination server.

But user need copy modified files and newly created files on source as compared to destination to be copied in separate folder.

I created 3 folders in /home as r1 r2 and r3. Then I touched 5 files named as 1 2 3 4 5 in r1 and r2 and r3 are empty.

Here source=/home/r1 destination=/home/r2 and difference=/home/r3

Output of ls -l for r1 r2 and r3 as given below:

[root@midnight home]# ls -l r1
total 0
-rw-r–r– 1 root root 0 Sep 17 01:30 1
-rw-r–r– 1 root root 0 Sep 17 01:30 2
-rw-r–r– 1 root root 0 Sep 17 01:30 3
-rw-r–r– 1 root root 0 Sep 17 01:30 4
-rw-r–r– 1 root root 0 Sep 17 01:30 5

[root@midnight home]# ls -l r2
total 0

[root@midnight home]# ls -l r3
total 0

Now. I will copy r1 to r2 and paste output.

rsync -va /home/r1/ /home/r2/

[root@midnight home]# rsync -va /home/r1/ /home/r2/
sending incremental file list
./
1
2
3
4
5

sent 306 bytes received 114 bytes 840.00 bytes/sec
total size is 0 speedup is 0.00

List all files from r2.

[root@midnight home]# ls -lt r2
total 0
-rw-r–r– 1 root root 0 Sep 17 01:30 1
-rw-r–r– 1 root root 0 Sep 17 01:30 2
-rw-r–r– 1 root root 0 Sep 17 01:30 3
-rw-r–r– 1 root root 0 Sep 17 01:30 4
-rw-r–r– 1 root root 0 Sep 17 01:30 5

 

Now let’s modify /home/r1/1 file and create two files as 6 and 7. And we need rsync to copy this modified file named as 1 and newly created file 6 & 7 to /home/r3 folder.

[root@midnight home]# rsync -aHxv –progress –compare-dest=/home/r2/ /home/r1/ /home/r3/
sending incremental file list
./
1
5 100% 0.00kB/s 0:00:00 (xfr#1, to-chk=6/8)
6
0 100% 0.00kB/s 0:00:00 (xfr#2, to-chk=1/8)
7
0 100% 0.00kB/s 0:00:00 (xfr#3, to-chk=0/8)

sent 285 bytes received 81 bytes 732.00 bytes/sec
total size is 5 speedup is 0.01

Above command copied  modified and newly created files to folder r3

[root@midnight home]# ls -l /home/r3
total 4
-rw-r–r– 1 root root 5 Sep 17 01:36 1
-rw-r–r– 1 root root 0 Sep 17 01:36 6
-rw-r–r– 1 root root 0 Sep 17 01:36 7