Attaching Block Volume Storage in Oracle Cloud Infrastructure Instance

 Attaching Block Volume Storage in Oracle Cloud Infrastructure Instance

1. Login to your OCI console, search for block volume or from the left hamburger menu, select "Storage" then "Block Volume" then "Create Block Volume"

2. Input your block volume name, compartment, AD, block volume size etc.

3. Once it is created, go to your instance and from left side you can see "Attach Block Volumes"  Then you need to make sure the attach type, compartment.

4. At the right of the side, you can see "iSCSI Commands & Information", click on that, you will see the commands to attach the volume to the instance.

5. Login to the linux instance. Issue the above commands. You can see a successful message.

6. Now to identify attach volume or device use unix command lsblk. This command helps you to identify the device for me its /dev/sbd

7. Format the disk using unix command fdisk and make file system using unix commnd  mkfs as you want in this case i am gong to make it as ext4 command is mkfs.ext4 /dev/sbb.

8. Create a folder directory for the mount mkdir /data

9. For permanent mounting you need to add an entry in /etc/fstab

/dev/sbd1 /data ext4 defaults,noatime,_netdev 0 2

10. Now we are going to mount. mount /dev/sdb1 /data

That's it. You can verify it using the command df -h

Office365 as SMTP

 How to configure Office365 as SMTP

You need to note that the from address and the authentication user should be same.

Port to be used is 25 (not 587)

sendmail sending email slow

 sendmail sending email slow

I have a linux box, which I configured sendmail and it is working fine. But the sending email is slow.

While checking the /var/log/maillogs I saw the following 

My unqualified host name (hostname) unknown; sleeping for retry

Sendmail is expecting a FQDN to start cleanly.

You need to set the hostname like <your_hostname>.localdomain and update /etc/hosts.

/etc/hosts

127.0.0.1   your_hostname.localdomain your_hostname localhost

Application Express Limitations in APEX Service

• Application authentication schemes not supported : LDAP, SSO, HTTP Header variable etc.

• OCI Web Application Firewall (WAF) service is not natively supported.

• Deployment of customer managed Oracle REST Data Services is not supported.

• Custom domain names are not natively supported.

• Oracle APEX runtime environment is not supported.

• Option to make a Service Request in Workspace Administration is DISABLED.

• Option to set SMTP parameters by using the APEX_INSTANCE_ADMIN package only.

• Limited support of procedures and functions for APEX_INSTANCE_ADMIN

• Disabled REST Administration interface, Workspace Purge Settings etc.

https://docs.oracle.com/en-us/iaas/apex/doc/apex-application-development-limitations.html

How to install JDK on linux

 Login to the server

wget https://files-cdn.liferay.com/mirrors/download.oracle.com/otn-pub/java/jdk/8u121-b13/jdk-8u121-linux-x64.rpm

rpm -ivh jdk-8u121-linux-x64.rpm

java -version

vi /etc/profile.d/java.sh

#!/bin/bash

JAVA_HOME=/usr/java/jdk1.8.0_121/

PATH=$JAVA_HOME/bin:$PATH

export PATH JAVA_HOME

export CLASSPATH=.

chmod +x /etc/profile.d/java.sh

source /etc/profile.d/java.sh

java -version

How to check which users logged and its time in linux server

 Someone in the server deleted a file. I need to know which user logged in also I need the IP

cat /var/log/secure | grep Accepted | awk '{print $1,$2,$3,$6,$11}'

Mar 22 03:52:19 Accepted 157.49.207.225

Mar 22 04:23:55 Accepted 202.83.59.155

Auto redirection of urls from http to https

Normally when a site is enabled with SSL, we need to auto redirect urls from http to https

Go to your web site's default document root folder.

Open your .httaccess file or create one ( I assume mod redirect is enabled in your web server)

Paste the below code.

RewriteEngine On 

RewriteCond %{HTTPS}  !=on 

RewriteRule ^/?(.*) https://%{SERVER_NAME}/$1 [R,L] 

Test your domain without http, it will automatically redirect to https