Oracle Linux 7 installation steps

Creating new users with Active Directory Administrative Center

Add windows system in Domain groups of systems

Oracle Database 19c Installation on Oracle Linux 7

Pre-installation settings before installing Oracle Database 19c

SELinux

If the OS is to be used for an Oracle installation, it is easier if Secure Linux (SELinux) is disabled or switched to permissive. To do this edit the "/etc/selinux/config" file, making sure the SELINUX flag is set as follows.

# vi /etc/selinux/config

SELINUX=permissive

If SELinux is configured after installation, the server will need a reboot for the change to take effect.

Firewall

If the OS is to be used for an Oracle installation, it is easier if the firewall is disabled. This can be done by issuing the following commands from a terminal window as the "root" user.

# systemctl stop firewalld

# systemctl disable firewalld

You can install and configure it later if you wish.

SSH

Make sure the SSH daemon is started using the following commands.

# systemctl start sshd.service

# systemctl enable sshd.service

Hosts File

The "/etc/hosts" file must contain a fully qualified name for the server.

127.0.0.1       localhost localhost.localdomain localhost4 localhost4.localdomain4

192.168.174.162 oracle19c

Set the correct hostname in the "/etc/hostname" file.

oracle19c

Oracle Installation Prerequisites

Automatic Setup:

Install "oracle-database-preinstall-19c" package to perform all prerequisite setup. use the following command

# yum install -y https://yum.oracle.com/repo/OracleLinux/OL7/latest/x86_64/getPackage/oracle-database-preinstall-19c-1.0-1.el7.x86_64.rpm

# yum install -y oracle-database-preinstall-19c

Manual Setup:

If you have not used the "oracle-database-preinstall-19c" package to perform all prerequisites, you have to manually perform the following setup tasks.

The following packages are listed as required. Don't worry if some don't install. It won't prevent the installation.

#basic packages to install

yum install -y bc

yum install -y binutils

yum install -y compat-libcap1

yum install -y compat-libstdc++-33

yum install -y elfutils-libelf

yum install -y elfutils-libelf-devel

yum install -y fontconfig-devel

yum install -y glibc

yum install -y glibc-devel

yum install -y ksh

yum install -y libaio

yum install -y libaio-devel

yum install -y libdtrace-ctf-devel

yum install -y libXrender

yum install -y libXrender-devel

yum install -y libX11

yum install -y libXau

yum install -y libXi

yum install -y libXtst

yum install -y libgcc

yum install -y librdmacm-devel

yum install -y libstdc++

yum install -y libstdc++-devel

yum install -y libxcb

yum install -y make

yum install -y smartmontools

yum install -y sysstat

#following 4 not available in oel8

yum install -y dtrace-modules

yum install -y dtrace-modules-headers

yum install -y dtrace-modules-provider-headers

yum install -y dtrace-utils

#(for Oracle RAC and Oracle Clusterware)

yum install -y net-tools

#(for Oracle ACFS)

yum install -y nfs-utils

#(for Oracle ACFS Remote)

yum install -y python

yum install -y python-configshell

yum install -y python-rtslib

yum install -y python-six

yum install -y targetcli

yum install libstdc* -y

yum install gcc -y

yum install gcc-c++ -y

yum install java-11-openjdk-devel

 Add the following lines to the "/etc/sysctl.conf" file, or in a file called "/etc/sysctl.d/98-oracle.conf".

# vi /etc/sysctl.conf

fs.file-max = 6815744

kernel.sem = 250 32000 100 128

kernel.shmmni = 4096

kernel.shmall = 1073741824

kernel.shmmax = 4398046511104

kernel.panic_on_oops = 1

net.core.rmem_default = 262144

net.core.rmem_max = 4194304

net.core.wmem_default = 262144

net.core.wmem_max = 1048576

net.ipv4.conf.all.rp_filter = 2

net.ipv4.conf.default.rp_filter = 2

fs.aio-max-nr = 1048576

net.ipv4.ip_local_port_range = 9000 65500

Run one of the following commands to change the current kernel parameters, depending on which file you edited.

/sbin/sysctl -p

# Or

/sbin/sysctl -p /etc/sysctl.d/98-oracle.conf

Add the following lines to a file called "/etc/security/limits.d/oracle-database-preinstall-19c.conf" file.

# vi /etc/security/limits.d/oracle-database-preinstall-19c.conf

oracle   soft   nofile    1024

oracle   hard   nofile    65536

oracle   soft   nproc    16384

oracle   hard   nproc    16384

oracle   soft   stack    10240

oracle   hard   stack    32768

oracle   hard   memlock    134217728

oracle   soft   memlock    134217728

Create the new groups and users.

groupadd -g 54321 oinstall

groupadd -g 54322 dba

groupadd -g 54323 oper

groupadd -g 54324 backupdba

groupadd -g 54325 dgdba

groupadd -g 54326 kmdba

groupadd -g 54327 asmdba

groupadd -g 54328 asmoper

groupadd -g 54329 asmadmin

groupadd -g 54330 racdba

useradd -u 54321 -g oinstall -G dba,oper oracle

usermod -g oinstall -G oracle oracle

Create the directories in which the Oracle software will be installed.

mkdir -p /home/app/oracle/product/19.3/dbhome_1

mkdir -p  /home/app/oradata

chown -R oracle:oinstall /home/app

chmod -R 775 /home/app/oradata

Edit .bash_profile file with oracle user,

vi .bash_profile

export ORACLE_BASE=/home/app/oracle

export ORACLE_HOME=/home/app/oracle/product/19.3/dbhome_1

export GRID_HOME=/home/app/grid

export ORACLE_UNQNAME=orcl

export ORACLE_SID=orcl

export PATH=$ORACLE_HOME/bin:$PATH

save and exit

Download Software:

Download Oracle 19c database software for Linux x86-64 from Oracle cloud and copy the files to linux server (on VirtualBox) using winscp or shared folder.

https://www.oracle.com/database/technologies/oracle19c-linux-downloads.html

You can choose "Create and configure a single instance database" option, If you want to install database software

Select Server class and Next.

Let's go with "Enterprise Edition":

 In next screen where we choose the Oracle base folder:

 

Select the directory for Oracle base. Notice that we do not have an option to select Oracle Home and it’s preselected with the directory where we have extracted software setup.

Select the type of database that you want.

Enter the Global database name and Oracle system identifier (SID)

Enable Automatic memory management or enter manually the values.

Choose the database character set from the following.

Browse the database file location for database storage and as mentioned Oracle recommends that you install data files and the Oracle database software on different disks.

Register with EM cloud if you the details or Click on Next.

Oracle Database 12c is managed by Oracle Database express by default.

Enable Recovery for your database if you want and specify the location.

Enter all accounts passwords or Use different passwords for SYS/SYSTEM accounts.

Select groups as per requirement and click NEXT.

Check the Automatically run configuration scripts or Click on Next step.

Below window will check the prerequisites for the installer.

Run the runfixup.sh file so all prerequisite will run automatically.

 Check the installer summary and click on Install.

Run the root.sh script need to be executed as the "root" user.

Click on close.

After successful creation of database check the database status.

That's it. Completed the Oracle database 19c Installation and creating a database.

How To Install Zabbix 4.4 Server On CentOS 7

Zabbix is an open source network monitoring software designed to monitor and track the status of various network devices, servers, and virtual machines

Update the system using below command

# yum update

Install required packages

# yum install  mariadb-server  httpd -y                          

# yum install php php-cli php-common php-devel php-pear php-gd php-mbstring php-mysql php-xml php-bcmath  

# systemctl start httpd

Install Repository with MySQL database

# mysql_secure_installation

Install yum repository to install Zabbix

CentOS/RHEL 7: 

rpm -Uvh https://repo.zabbix.com/zabbix/4.4/rhel/7/x86_64/zabbix-release-4.4-1.el7.noarch.rpm

After adding Zabbix apt repository in your system use following command to install Zabbix server.

 # yum install zabbix-server-mysql zabbix-web-mysql zabbix-agent zabbix-java-gateway

Create initial database schema

# mysql -u root -p

mysql> create database zabbix character set utf8 collate utf8_bin;

mysql> grant all privileges on zabbix.* to zabbix@localhost identified by 'Password';

FLUSH PRIVILEGES;

mysql> quit;

Import initial schema and data. You will be prompted to enter your newly created password.

 # zcat /usr/share/doc/zabbix-server-mysql*/create.sql.gz | mysql –u zabbix -p zabbix

Configure the database for Zabbix server

Edit file /etc/zabbix/zabbix_server.conf

Update the following database configurations. This will be used by Zabbix server to connect to the database.

DBHost=localhost

DBName=zabbix

DBUser=zabbix

DBPassword=password

Configure PHP for Zabbix frontend

Edit file /etc/httpd/conf.d/zabbix.conf, uncomment and set the right timezone for you.

# php_value date.timezone Asia/Kolkata

Start Zabbix server and agent processes and make it start at system boot:

# systemctl start zabbix-server zabbix-agent httpd mariadb

# systemctl enable zabbix-server zabbix-agent httpd mariadb

Now your Zabbix server is up and running!

Configure Zabbix frontend

Connect to your newly installed Zabbix frontend: http://server_ip_or_name/zabbix

Follow steps described in Zabbix documentation: Installing frontend

 Start using Zabbix

Check for pre-requisites

Check if you meet all the system requirements. If not configure your php.ini.

Configure DB Connection

Fill your DB details which you created and click on Next Step 

Zabbix server details

This is the host and port of running Zabbix server. As your Zabbix server is running on the same host, so keep the values unchanged. You can give a name for your instance.

 Pre-Installation Summary

This will give you a summary of your configuration. Click on Next Step

Install Zabbix

Click on Finish button to install Zabbix server

Install Zabbix

You will see a successful installation message on this page. This will also show you a message for the created configuration file.

Login to Zabbix

Login to Zabbix with following credentials

UserName          : Admin

Password    : Zabbix

You will see your Zabbix home screen now

Congratulation! Your Zabbix setup has been completed.

Creating new users with the dsadd command

Adding a new user with the dsadd command with Command Prompt

Distinguished name (DN) for the new AD object, and is required.

Cn - comman name

Dc - Domain controller

Fn - First name

In - Last name

Pwd - Password

dsadd user “cn=Tech Bir,cn=Users,dc=kb,dc=com” -samid techbir -upn techbir@kb.com -fn Tech -ln Bir -display “Tech Bir” -disabled no -pwd “PassW0rd” -mustchpwd yes

After successfully user created. You can check by find users as like below.

See users properties and all details.

Creating new users with Active Directory Administrative Center

Active Directory Administrative Center is the easiest management tool to get to grips with. You’ll need to log in to Windows Server 2016 with a domain administrator account

 To run ADAC, start Server Manager by clicking the blue icon next to the Start button on the desktop taskbar. In Server Manager, select Active Directory Administrative Center from the Tools menu.

  In the Active Directory Administrative Center, click Users below ad (local) in the left pane.

In the Tasks pane on the right, click New under Users, and select User from the menu.

In the Create User dialog box, Start by filling out the First name and Last name fields, and the Full name.All new users must have a Same Account Name, which is the user’s AD logon name. Enter and confirm a password, and then click OK.

 

 The user will be required to change the password the first time they log on, and don’t forget that the password you set must meet the password complexity requirements set in domain policy.

 

How to create Domain user in Active Directory

Open Active Directory Users and Computers MMC

Right click the folder where you want to create the new user account, select new and then click user. If you have not created additional organizational units, you can put the new account in the Users folder.

First name: Fill in user’s first name.

Initials: Fill in user’s middle initials. This can be used if there are conflicts when creating the user logon name.

Last name: Fill in user’s last name.

Full name: This will fill in automatically.

User logon name: This is the name used to log into windows domain.

In the password and confirm password field type the user’s password, click next and finish.

This completes creating the new Active Directory user account.

 At this point you may need to open the account.

Add additional information such as: Address, Profile path, Logon script, Organization details and adding the user to other Active Directory groups to provide access to additional domain resources.