Adding-NewServer-OpenStack-AlmaLinux9.txt

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+ How to Add a New Compute Node with OpenStack Cloud    +
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+ Ready for Adding as Compute Node With OpenStack +
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#This Configuration do on Compute Node

#Checking System Informations

hostnamectl

cat /etc/redhat-release

grep -E ' svm | vmx' /proc/cpuinfo

lsmod | grep kvm

lscpu

free -h

lsblk

#Configure Common Setup

hostnamectl set-hostname cloud

ip a

yum install nano -y

#Need to Configure Static IP

#Check Network Card Info file

ls /etc/sysconfig/network-scripts/

#Note: If OS are Almalinux 9 may be couldn't find NIC file in network-scripts folder. 
#This problem for solutions:

#Enable CRB  Repository

dnf config-manager --set-enabled crb

#Install Epel and Epel Next on Almalinux 9

dnf install epel-release -y

#Working On AlmaLinux 9

dnf install centos-release-openstack-yoga -y

yum clean all

# Install network-scripts package

yum install network-scripts -y

# Enable/Start Network Service

systemctl status network
systemctl start network
systemctl enable network

systemctl restart network

#### Check Network Card Info file

ls /etc/sysconfig/network-scripts/

#### Remember the IP and MAC Addresses
ip a

#### Edit Network Interface File
nano /etc/sysconfig/network-scripts/ifcfg-enp1s0

#Paste bellow in ifcfg-enp1s0 file

HWADRR=1c:1b:0d:8b:c6:ba
NM_CONTROLLED=no
BOOTPROTO=static
ONBOOT=yes
IPADDR=192.168.0.150
PREFIX=24
GATEWAY=192.168.0.1
DNS1=8.8.8.8
DNS2=8.8.4.4
DEVICE=enp1s0

nmcli connection up enp1s0

ip a s enp1s0

systemctl restart NetworkManager

ping google.com

cp /etc/sysconfig/network-scripts/ifcfg-enp1s0 /etc/sysconfig/network-scripts/ifcfg-enp1s0.bak

cat /etc/sysconfig/network-scripts/ifcfg-enp1s0

#Edit Hosts file:
#For OpenStack Controller Node

echo "192.168.0.50 cloud.paulco.xyz cloud" >> /etc/hosts

#For OpenStack Compute Node

echo "192.168.0.51 cloud1.paulco.xyz cloud1" >> /etc/hosts

#Checking SELinux

getenforce

#Disable SELinux

#setenforce 0

sed -i 's/^SELINUX=.*/SELINUX=disabled/g' /etc/selinux/config

# Disable Firewalld
systemctl disable firewalld
systemctl stop firewalld

# Disable/Stop NetworkManager
systemctl status NetworkManager
systemctl disable NetworkManager
systemctl stop NetworkManager

#systemctl restart NetworkManager

ifup enp0s3

#ifdown enp0s3

#systemctl mask NetworkManager.service
#systemctl stop NetworkManager.service
#systemctl disable NetworkManager.service
#systemctl list-unit-files | grep NetworkManager

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yum autoremove epel-release

yum autoremove openstack-packstack
 
yum clean all

yum repolist

yum update -y && yum upgrade -y

reboot



#After Reboot check iptables status

systemctl status iptables

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+ Now Working On OpenStack Controller Node              +
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#Go to OpenStack Controller node

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#Edit Hosts file:
#For OpenStack Controller Node

echo "192.168.0.50 cloud.paulco.xyz cloud" >> /etc/hosts

#For OpenStack Compute Node

echo "192.168.0.51 cloud1.paulco.xyz cloud1" >> /etc/hosts

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#SSH passwordless connection

ssh-keygen

cat ~/.ssh/id_rsa.pub

ssh-copy-id root@192.168.101.231

ssh root@192.168.101.231

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#From OpenStack Controller Node
#vi /etc/sysconfig/iptables

iptables -L

#Allow bellow mentioned Port in iptables roles

iptables -I INPUT -p tcp --dport 5672 -j ACCEPT

iptables -I INPUT -p tcp --dport 15672 -j ACCEPT

iptables -I INPUT -p tcp --dport 3306 -j ACCEPT

iptables -I INPUT -p udp --dport 53 -j ACCEPT

iptables -I INPUT -p udp --dport 67 -j ACCEPT

#iptables -I INPUT -p tcp --dport 3260 -j ACCEPT

#iptables -A INPUT -p tcp --dport 22 -s 0/0 -j ACCEPT

service iptables save

systemctl restart iptables

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#From OpenStack Controller Node
#Edit the answer file

cp answers.txt answers.txt.orginal

vi answers.txt

EXCLUDE_SERVERS= [Given Existing Nodes IP] 

CONFIG_COMPUTE_HOSTS= [Given New Compute Nodes IP]

NTP=0.asia.pool.ntp.org,1.asia.pool.ntp.org,2.asia.pool.ntp.org,3.asia.pool.ntp.org

#Before run bellow command, '#' will be removed.

packstack --answer-file #/root/answers.txt | tee adding-Node-log.txt

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#If we get this Error When run avobe command

#Error 1: Pre installing Puppet and discovering hosts' details[ ERROR ].

#Error 2: GPG Keys are configured as: file:///etc/pki/rpm-gpg/RPM-GPG-KEY-AlmaLinux.

#Cause: 
Almalinux 8 Update & Upgrade related problem. we need to changes AlmaLinux 8 GPG key.

#Solution:
Ref: https://almalinux.org/blog/2023-12-20-almalinux-8-key-update/
#Import the the GPG key in almalinux8

rpm --import https://repo.almalinux.org/almalinux/RPM-GPG-KEY-AlmaLinux

dnf clean packages

dnf upgrade almalinux-release

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##Installation is Completed Check Compute Node 

rpm -qa | grep -i openstack

#Check nova-compute log From Compute Node

tail -f /var/log/nova/nova-compute.log

tail -n 20 /var/log/nova/nova-compute.log

yum install -y openstack-utils

openstack-service status

openstack-service restart

openstack-service start

openstack-status

ovs-vsctl show

##Check on Controller Node

nova hypervisor-list

#Add the compute node to the cell database
#Important
#Run the following commands on the controller node.

#Source the admin credentials to enable admin-only CLI commands 

. admin-openrc

#Then confirm there are compute hosts in the database

openstack compute service list --service nova-compute

#Discover compute hosts:

su -s /bin/sh -c "nova-manage cell_v2 discover_hosts --verbose" nova

#Alternatively, you can set an appropriate interval in /etc/nova/nova.conf:

vi /etc/nova/nova.conf

[scheduler]
discover_hosts_in_cells_interval = 300

openstack compute service list

nova-status upgrade check

virsh list --all

nova hypervisor-servers compute2

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systemctl restart openvswitch libvirtd neutron-openvswitch-agent openstack-nova-compute
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Ways 2: Add Node
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yum install openstack-nova-compute openstack-neutron openstack-neutron-openvswitch -y


sed -i.bak -e 's/\/32/\/16/' /etc/sysconfig/iptables

ls -l /etc/sysconfig/iptables*

systemctl restart iptables

iptables -L

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Error: OpenStack error: Host is not mapped to any cell

Ref:
https://cloud.tencent.com/developer/article/1501368

Solution:

nova-manage cell_v2 discover_hosts --verbose
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3.
Error: Exceeded maximum number of retries. Exhausted all hosts available for retrying build failures for instance

Solution:

systemctl restart openstack* neutron* libvirtd

systemctl status openstack* neutron* libvirtd

systemctl restart neutron*

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service openstack-nova-compute restart

systemctl restart openstack-nova-compute.service

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+ Error: When Adding compute Node     +
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1.
Job for neutron-ovs-cleanup.service failed because a fatal signal was delivered causing the control process to dump core.

Solution:
#Go to Controler Node

. keysourcerc_admin

neutron-linuxbridge-cleanup

2.
OpenStack error: Host is not mapped to any cell

Solution:
#Go to Controler Node

. keysourcerc_admin

nova-manage cell_v2 discover_hosts --verbose 

#You can identify this using the openstack compute service list command:

openstack compute service list --service nova-compute

#Once that has happened, you can scan and add it to the cell using the nova-manage cell_v2 discover_hosts command:

nova-manage cell_v2 discover_hosts

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