PackStack Quick Start
PackStack (formerly known as RDO) is quick installation for OpenStack provided by RedHat
- VM under Proxmox VE 6, 6GB of RAM, 2x core, 12GB disk space
- Tested VM OS (where PackStack is installed):
CentOS Linux release 7
WARNING! I don't recommend using CentOS 8 for these two reasons:
- shorter EOL (Dec 2021) than CentOS 7 EOL (June 2024) - see
- only CentOS Stream will be available in future:
I strongly recommend this (very good indeed!) guide as starting point:
- https://www.tecmint.com/openstack-installation-guide-rhel-centos/ Or official installation guide form:
- https://www.rdoproject.org/install/packstack/
However I rather used this one which allows access from existing network:
I just additionally enabled Heat (provisioning), Pointed cinder to
dedicated volume group stack-vg
, disabled Swift (S3
like service), disabled Ceilometer (Performance monitoring). You can
see my latest setup script here:
There is manual demo user setup on above page - I automated part (!) of setup here:
- https://github.com/hpaluch/openstack-examples/blob/master/packstack/setup_demo.sh But be warned that I use unique names to catch errors in parameters definition.
Notes:
- out of the box the demo user/vm can access Internet, thanks to provided NAT.
- However if you need to access VM from your physical network you need to:
-
create floating IP address on pool
external_network
(say192.168.0.39
in my example) -
associate it with running instance
-
you can directly access your demo (
cirros-1
from mysetup_demo.sh
script) running instance using Floating IP address (for example SSH to192.168.0.39
in my example):# key demo_kp.pem was created in HOME directory # by `setup_demo.sh` script on your PackStack server ssh -i demo_kp.pem cirros@192.168.0.39
-
After bare metal install (8GB RAM, AMD X-2 dual-core) of Train
release I noticed very bad performance.
When user demou
issued this trivial command it took around 8 seconds:
time openstack server list
# or nice --timing parameter
# from https://ask.openstack.org/en/question/99737/2-second-delay-on-openstack-api/
time openstack server list --timing
I just tried this command to verify that keystone caching is not enabled:
$ sudo keystone-manage doctor
WARNING: `keystone.conf [cache] enabled` is not enabled.
Caching greatly improves the performance of keystone, and it is highly
recommended that you enable it.
I verified that memcached
is already installed and running:
$ ps ax | grep memcached
1338 ? Ssl 0:01 /usr/bin/memcached -p 11211 -u memcached -m 797 -c 8192 -l 0.0.0.0 -U 11211 -t 2 >> /var/log/memcached.log 2>&1
11571 pts/0 R+ 0:00 grep --color=auto memcached
And tested with telnet:
$ sudo yum install telnet
$ telnet localhost 11211
...
Connected to localhost.^M
Escape character is '^]'.^M
stats
STAT pid 1338
STAT uptime 3891
STAT time 1608026790
...
END
quit
So I followed this page https://docs.openstack.org/keystone/latest/admin/configuration.html#configure-the-memcached-back-end-example
to enable Memcached backend for Keystone - I changed file /etc/keystone/keystone.conf
:
diff -u /etc/keystone/keystone.conf{.orig,}
--- /etc/keystone/keystone.conf.orig 2020-12-15 10:21:06.069000000 +0100
+++ /etc/keystone/keystone.conf 2020-12-15 11:06:58.117000000 +0100
@@ -374,6 +374,10 @@
[cache]
+# from https://docs.openstack.org/keystone/latest/admin/configuration.html#configure-the-memcached-back-end-example
+enabled = true
+backend = dogpile.cache.memcached
+backend_argument = url:127.0.0.1:11211
#
# From oslo.cache
And then restarted keystone (it is actually Python module run in Apache process):
sudo systemctl restart httpd
When I tried again time openstack server list
I got a bit better response - around 5 seconds.
Hmm a bit better but still quite bad.
Also note that Idle system (no running instance and no active commands) causes load average around 1.0
Last RedHat guide for Manual OpenStack installation - very useful if want to know how OpenStack works:
Copyright © Henryk Paluch. All rights reserved.
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