Login using SSH into a new EC2 instance created from an custom AMI (image)

 Not able to login (SSH) to EC2 running Linux(Custom AMI)

Solution 

Login as ec2-user 

sudo su - root 

first use source *.pem key to login ec2 instance launch from custom AMI using ec2-user 

enable PasswordAuthentication to yes

vi /etc/ssh/sshd_config

PasswordAuthentication yes

systemctl restart sshd

then login with root user with same password as source. 

How to check Linux distribution and version

 

check Linux  distribution and version

[root@localhost ~]# cat /etc/os-release

NAME="Oracle Linux Server"

VERSION="7.8"

ID="ol"

ID_LIKE="fedora"

VARIANT="Server"

VARIANT_ID="server"

VERSION_ID="7.8"

PRETTY_NAME="Oracle Linux Server 7.8"

ANSI_COLOR="0;31"

CPE_NAME="cpe:/o:oracle:linux:7:8:server"

HOME_URL="https://linux.oracle.com/"

BUG_REPORT_URL="https://bugzilla.oracle.com/"

ORACLE_BUGZILLA_PRODUCT="Oracle Linux 7"

ORACLE_BUGZILLA_PRODUCT_VERSION=7.8

ORACLE_SUPPORT_PRODUCT="Oracle Linux"

ORACLE_SUPPORT_PRODUCT_VERSION=7.8

[root@localhost ~]#

[root@localhost ~]# cat /etc/redhat-release

Red Hat Enterprise Linux Server release 7.8 (Maipo)

[root@localhost ~]#

[root@localhost ~]# cat /etc/oracle-release

Oracle Linux Server release 7.8

[root@localhost ~]#

check kernel version 

[root@localhost ~]# uname -r

4.14.35-1902.300.11.el7uek.x86_64

[root@localhost ~]#

To check Package is installed or not 

rpm -q package_name

rpm -qa --queryformat "%{NAME}-%{VERSION}-%{RELEASE} (%{ARCH})\n" | grep package_name

[root@localhost ~]#

[root@localhost ~]# rpm -qa --queryformat "%{NAME}-%{VERSION}-%{RELEASE} (%{ARCH})\n" | grep ssh 

openssh-server-7.4p1-21.0.1.el7 (x86_64)

openssh-7.4p1-21.0.1.el7 (x86_64)

openssh-clients-7.4p1-21.0.1.el7 (x86_64)

libssh2-1.8.0-3.el7 (x86_64)

[root@localhost ~]#

check multiple packages, and review the output for the validations

rpm -q binutils compat-libstdc++ gcc glibc libaio libgcc libstdc++ \

make sysstat unixodbc

[root@localhost ~]# rpm -q binutils compat-libstdc++ gcc glibc libaio libgcc libstdc++ \

> make sysstat unixodbc

binutils-2.27-43.base.0.1.el7.x86_64

package compat-libstdc++ is not installed

gcc-4.8.5-39.0.3.el7.x86_64

glibc-2.17-307.0.1.el7.1.x86_64

libaio-0.3.109-13.el7.x86_64

libgcc-4.8.5-39.0.3.el7.x86_64

libstdc++-4.8.5-39.0.3.el7.x86_64

make-3.82-24.el7.x86_64

sysstat-10.1.5-19.el7.x86_64

package unixodbc is not installed

[root@localhost ~]#

PostgreSQL Administration Certificate

 

Download Microsoft Windows Server 2019

 Download Windows Server 2019

https://www.microsoft.com/en-in/evalcenter/download-windows-server-2019