Adding New Compute Node with Existing OpenStack Cloud

How to Add a New Compute Node with Existing OpenStack Cloud

Pre-Installation for Adding New Compute Node

💻 This Configuration do on Compute Node

git clone https://github.com/SumonPaul18/adding-computenode-openstack.git
cd adding-computenode-openstack
chmod +x adding-compute-node.sh
. adding-compute-node.sh

Verifying the System Informations

Verifying Host Name

hostnamectl

Verifying vmx Capable Processor

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

Verifying kmv Enable in Processor

lsmod | grep kvm

Verifying Processor Specification

lscpu

Verifying RAM Usage

free -h

Verifying Storage Partitions

lsblk

Now Working On New Computer/Server, Which we want to connect with Existing OpenStack Cloud

hostnamectl set-hostname cloud1

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

Install OpenStack-PackStack Package, Here i'm choosing openstack-yoga Version

dnf install centos-release-openstack-yoga -y

YUM Packages Cache Clean

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

Connection UP Network Interface

nmcli connection up enp1s0

Verifying Network Interface

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 All in One Controller Node

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

For OpenStack New Compute Node

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

Checking SELinux

getenforce

Disable SELinux

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

Network Interface UP

ifup enp0s3

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

Now Working On OpenStack Controller Node

Go to OpenStack Controller node

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

SSH passwordless connection

ssh-keygen

cat ~/.ssh/id_rsa.pub

ssh-copy-id root@192.168.0.95

ssh root@192.168.0.95

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

From OpenStack Controller Node

Edit the answer file

cp answers.txt answers.txt.orginal

vi answers.txt

Enter Existing Server IP or Hostname.

EXCLUDE_SERVERS= 192.168.0.50

Enter New Server IP or Hostname

CONFIG_COMPUTE_HOSTS= 192.168.0.95

Setup NTP Server, Find NTP Section

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

If You Get Error

Types of Error

Error: Pre installing Puppet and discovering hosts' details[ ERROR ] Error: GPG Keys are configured as: file:///etc/pki/rpm-gpg/RPM-GPG-KEY-AlmaLinux

Causes

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

Solution:

Reference: 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 

Clean Packages

dnf clean packages

Now, Upgrade Almalinux-Release

dnf upgrade almalinux-release

When, Installation is Completed Verifying to the Compute Node

rpm -qa | grep -i openstack

Check nova-compute log From Compute Node

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

Install OpenStack Utilits

yum install -y openstack-utils

Verifying OpenStack Services

openstack-service status

Start OpenStack Services

openstack-service start

Restart OpenStack Services

openstack-service restart

Another Command, Verifying OpenStack Status

openstack-status

Verifying to Open Virtual Switch

ovs-vsctl show

Verifying on to 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

Find scheduler Section in /etc/nova/nova.conf file

[scheduler]
discover_hosts_in_cells_interval = 300

Verifying to Compute Service List

openstack compute service list

Verifying to Nova Status

nova-status upgrade check

Verifying to Running VMs State

virsh list --all

Setup New Server with New Server Hostname

nova hypervisor-servers cloud1

Restart, Some OpenStack Services

systemctl restart openvswitch libvirtd neutron-openvswitch-agent openstack-nova-compute

Error: IPtables OR IP Can't Access Related Errror

Solution:

Allow Your IP Block/CIDR in IPtables file

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

Verifying IPtables lists

 ls -l /etc/sysconfig/iptables*

Restart IPtables Service

systemctl restart iptables

Verifying IPtables, Another Approach

iptables -L

Error: Host is not mapped to any cell

Error: OpenStack error: Host is not mapped to any cell > Reference: > https://cloud.tencent.com/developer/article/1501368

Solution:

Go to Controler Node

. keysourcerc_admin

nova-manage cell_v2 discover_hosts --verbose

We 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

Error: Exceeded maximum number of retries. Exhausted all hosts available for retrying build failures for instance

Solution:

Restart Some OpenStack Services

 systemctl restart openstack* neutron* libvirtd

Verifying Status

 systemctl status openstack* neutron* libvirtd

Restart Neutron Services

 systemctl restart neutron*

Restart Nova-Computer Service

service openstack-nova-compute restart

Restart Nova-Computer Service, Another Approach

systemctl restart openstack-nova-compute.service

Error: When Adding compute Node

Error Details:

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

Cleanup LinuxBridge

neutron-linuxbridge-cleanup

Thank You