OpenStack：heat安装使用-Openstack Heat try-out

Openstack Heat try-out

What’s Heat ?

How to install Heat and make it ready to use?

1.Installation
2.Prepare JEOS(Just enough OS)

Use cases

1.Deploy a single WordPress blog server with a floating IP associated.
2.Deploy wordpress blog server with 2 VM instances(front-end + back-end topology)
3.Deploy a wordpress blog server with EBS volume as mysql DB storage
4.Deploy a wordpress blog server with HA protection enabled

What’s Heat ?

Heat is a service to orchestrate multiple composite cloud applications using the AWS CloudFormation template format, it’s Openstack’s implementation of CloudFormation and CloudWatch.

Heat integrates other core components of OpenStack into a one-file template system. The templates allow creation of most OpenStack resource types, the main functions of Heat cover:

-vAPP stack creation/update/deletion (suspend/resume will be added in Havana)
-High Availability
-Autoscaling
-Manual scale in/out(in Havana)

How to install Heat and make it ready to use?

1.Installation

->Heat has been included in RDO repo, installation can be done by Yum:

yum install openstack-heat-api openstack-heat-api-cfn openstack-heat-api-cloudwatch openstack-heat-cli openstack-heat-common openstack-heat-engine python-heatclient python-heatclient-doc heat-cfntools heat-jeos

->Comment out following line since we use RabbitMQ instead of QPID as message queue. Do this for heat-api-cfn.conf, heat-api-cloudwatch.conf, heat-api.conf, heat-engine.conf under /etc/heat.

#rpc_backend=heat.openstack.common.rpc.impl_qpid

->Configure [filter:authtoken] section of heat-api-cfn-paste.ini heat-api-cloudwatch-paste.ini heat-api-paste.ini under /etc/heat

[filter:authtoken]
paste.filter_factory = heat.common.auth_token:filter_factory
service_protocol = http
service_host = api-vip
service_port = 5000
auth_host = api-vip
auth_port = 35357
auth_protocol = http
auth_uri = http://api-vip:35357/v2.0admin_tenant_name = service
admin_user = heat
admin_password = password

->Configure [filter:ec2authtoken] section of heat-api-cfn-paste.ini heat-api-cloudwatch-paste.ini under /etc/heat

[filter:ec2authtoken]
paste.filter_factory = heat.api.aws.ec2token:EC2Token_filter_factory
auth_uri = http://api-vip:5000/v2.0
keystone_ec2_uri = http://api-vip:5000/v2.0/ec2tokens

>Update /etc/heat/heat-engine.conf as below:

heat_metadata_server_url = http://10.68.125.11:8000
heat_waitcondition_server_url = http://10.68.125.11:8000/v1/waitcondition
heat_watch_server_url = http://10.68.125.11:8003
sql_connection = mysql://heat:heat@db-vip/heat

#The IP for metadata, watchcondition and watch_server should be the host IP of heat services are running on, and should be reachable from VM instance.

->Setup database for heat:

heat-db-setup rpm -y -r <root password of mysql>

->Setup keystone entries for heat:

heat-keystone-setup

->Start heat services:

service openstack-heat-api start
service openstack-heat-api-cfn start
service openstack-heat-api-cloudwatch start
service openstack-heat-engine start

2.Prepare JEOS(Just enough OS)

JEOS image is basic OS image with cloud-init and heat-cfn-tools pre-installed, they are the keys for Heat and VM exchanging information and doing post and regular jobs.

Pre-built JEOS of Fedora 17 and 18 can be downloaded from: http://fedorapeople.org/groups/heat/prebuilt-jeos-images/

To make our own JEOS on RHEL, following the steps:

a.Assume we have a RHEL 6.3 image registered in Glance already, launch a VM instance from it.
b.Log into the VM, install cloud-init and heat-cfn-tools

yum -y update
export http_proxy=<http proxy server IP> #This is needed if lab has no direct internet access
curl -O http://ftp.ps.pl/pub/Linux/fedora-epel/6/i386/epel-release-6-7.noarch.rpm
rpm -Uvh epel-release-6-7.noarch.rpm
yum -y install perl python python-setuptools cloud-init python-pip
pip-python install argparse ‘boto==2.5.2′ heat-cfntools
cfn-create-aws-symlinks –source /usr/bin
rm -rf /etc/udev/rules.d/70-persistent-net.rules

c.From Horizon GUI or CLI, make a snapshot for this VM, name it as “rhel63-x86_64-cfntools”. This snapshot actually becomes a valid JEOS image.

Use cases

1.Deploy a single WordPress blog server with a floating IP associated.

This templates deploy a single VM instance with a associated floating IP, then install mysql-server, httpd and wordpress packages, initial database, integrate each other and finally start up wordpress web service.

->Download the template file:

wget https://github.com/abckey/heat-templates/raw/master/WordPress_Single_Instance_With_EIP.template

->Source a tenant credential

source /root/nceprc

>Create a key-pair

nova keypair-add ncepkey > ncepkey.pem

chmod 400 ncepkey.pem

->Deploy this template by heat

heat stack-create wordpress -f WordPress_Single_Instance_With_EIP.template -P “InstanceType=m1.medium;DBUsername=wordpress;DBPassword=worldpress;KeyName=ncepkey;LinuxDistribution=RHEL-6.3″

#Parameters followed after “-P” are needed for instance type selection, DB access setup, key-pair selection and image selection.

->Check stack creation process

Once the stack-create is issued, we should see the stack in “CREATE_IN_PROGRESS” status from output of “heat list”

Once creation is complete, we can see the status will change to “CREATE_COMPLETE”.

We can also see detailed resource status in the stack by:

Also heat stack-show wordpress can be used to show detailed information of the stack

->Try to access the wordpress web UI

From nova list, we could see a VM named “wordpress.WebServer” is created with internal IP and floating IP:

Try to access the wordpress website by its floating IP

http://10.68.124.102/wordpress

You should see the login page in the browser!!!

2.Deploy wordpress blog server with 2 VM instances(front-end + back-end topology)

This template deploy a 2 VM wordpress solution, one VM running web server, 2nd VM running Mysql DB.

->Download the template:

wget https://github.com/abckey/heat-templates/raw/master/WordPress_2_Instances.template

->Deploy the template by heat

heat stack-create wp-2-vm -f WordPress_2_Instances.template -P “InstanceType=m1.medium;DBUsername=wordpress;DBPassword=worldpress;KeyName=ncepkey;LinuxDistribution=RHEL-6.3″

>From heat resource-list wp-2-vm, we can see 2 VM instances are created, also a floating IP and association with Webserver is there

->Try wordpress website with floating IP of WebServer VM instance

http://10.68.124.103/wordpress

3.Deploy a wordpress blog server with EBS volume as mysql DB storage

This template deploy a VM instance with httpd, wordpress and mysql-server installed, a EBS volume is attached to instance as Mysql DB storage point.

->Download the template

wget https://github.com/abckey/heat-templates/raw/master/WordPress_Single_Instance_With_EBS_EIP.template

->Deploy

heat stack-create wp-ebs -f WordPress_Single_Instance_With_EBS_EIP.template -P “VolumeSize=5;InstanceType=m1.medium;DBUsername=wordpress;DBPassword=worldpress;KeyName=ncepkey;LinuxDistribution=RHEL-6.3″

#Here we need use parameter “VolumeSize” to specify the volume size we intend to use as DB storage.

->From resource list , we can see it has volume and volume attachment there

->Check volume and attachment

Inside vm, we can check mounts:

[root@wp-ebs ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/vda1 5.0G 1.6G 3.1G 34% /
tmpfs 1.9G 0 1.9G 0% /dev/shm
/dev/vdb1 938M 39M 853M 5% /var/lib/mysql

->Try to access wordpress by floating IP.

4.Deploy a wordpress blog server with HA protection enabled

This template deploy a VM instance with wordpress server installed, and HA is enabled to monitor httpd/mysqld services to make sure they are already running.

->Download template:

wget https://github.com/abckey/heat-templates/raw/master/WordPress_Single_Instance_With_HA.template

->Assign admin role to the tenant user by “ keystone user-role-add” command.

To use HA, waitcondition resource is needed, which needs to create an ec2signed url and to do that it creates a restricted user in keystone. To create any user in keystone we need admin rights:(

This issue has been addressed by a bug ticket: https://bugs.launchpad.net/bugs/1089261

keystone user-role-add –user <ncep user id> –role <admin role id> –tenant-id <ncep tenant id>

->Deploy

heat stack-create wp-ha -f WordPress_Single_Instance_With_HA.template -P “HupPollInterval=1;InstanceType=m1.medium;DBUsername=wordpress;DBPassword=worldpress;KeyName=ncepkey;LinuxDistribution=RHEL-6.3″

#Parameter “HupPollInterval” is needed to specify the cfn-hup process running interval in minutes, cfn-hup is to check services status, and restart them if return code of “service <service name> status” is not “0″.

->Check resource

Here “WaitCondition” actually is waiting VM instance is properly started and configured, then goes to next step

Whole resource list after create_complete:

Resource “OS::Heat::HARestart” takes care of service HA.

->Try to access wordpress web by floating IP

->Try HA by stopping httpd service

In the VM, do service httpd stop.

Check cfn-hup.log

[root@wp-ha ~]# tail -f /var/log/cfn-hup.log

DEBUG [2013-08-05 16:28:02,552] Running command: /sbin/service httpd status
DEBUG [2013-08-05 16:28:02,609] Return code of 3 after executing: ‘['su', 'root', '-c', u'/sbin/service httpd status']‘
WARNING [2013-08-05 16:28:02,610] Restarting service httpd
DEBUG [2013-08-05 16:28:02,610] Running command: /sbin/service httpd start
DEBUG [2013-08-05 16:28:02,732] Running command: /etc/cfn/notify-on-httpd-restarted
DEBUG [2013-08-05 16:28:03,634] Running command: /sbin/service mysqld status
DEBUG [2013-08-05 16:28:03,714] Running command: /sbin/service crond status

We can see once cfn-hup found httpd service has problem, it tried to start httpd service.

->Check wordpress web access again, it should work again.

原文处处不明，此处为笔记，侵删。

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