Bug 1303939 - Router's replica is set to 0 by ansible installer.
Router's replica is set to 0 by ansible installer.
Product: OpenShift Container Platform
Classification: Red Hat
Component: Installer (Show other bugs)
Unspecified Unspecified
medium Severity medium
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Assigned To: Jason DeTiberus
Ma xiaoqiang
Depends On:
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Reported: 2016-02-02 08:10 EST by Gan Huang
Modified: 2016-07-03 20:46 EDT (History)
7 users (show)

See Also:
Fixed In Version: openshift-ansible-3.0.40-1.git.1.4385281.el7aos
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2016-02-29 07:57:40 EST
Type: Bug
Regression: ---
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Verified Versions:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
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Description Gan Huang 2016-02-02 08:10:08 EST
Description of problem:
After installation, router's replica is set to 0 by ansible installer.

Go through ansible code, the following code have some problem.
1. The judgement of "openshift.master.infra_nodes is defined" in playbooks/common/openshift-master/config.yml is incorret. 
  - set_fact:
      openshift_infra_nodes: "{{ hostvars | oo_select_keys(groups['nodes'])
                                 | oo_nodes_with_label('region', 'infra')
                                 | oo_collect('inventory_hostname') }}"
    when: openshift_infra_nodes is not defined
- name: Create services
  - role: openshift_router
    when: openshift.master.infra_nodes is defined
  - role: openshift_registry
    when: openshift.master.infra_nodes is defined and attach_registry_volume | bool
When openshift_infra_nodes var is not define in user's host file, ansible is trying to using "region=infra" to filter nodes, when no nodes matched, openshift_infra_nodes will be define as an empty array, so openshift_router playbook will be still called. So "openshift.master.infra_nodes is defined" should be corrected to "openshift.master.infra_nodes' length is non-zero"

2. router's replica will be decided by the number of node which have "region=infra" label in roles/openshift_router/tasks/main.yml, it is a little improper, especially when user did not install any infra node and specifying openshift_router_selector='region=primary'.
In my scanriose, I want to deploy router to 'region=primary' node, but ansible installer still using "'region=infra" to match node, when no matched nodes found, it is setting replica to 0. That would confuse customer. If anisble installer could use openshift_router_selector var to filter node for setting replica that would be reasonable and perfect.

Version-Release number of selected component (if applicable):
https://github.com/openshift/openshift-ansible -b master

How reproducible:

Steps to Reproduce:
1.Set up an env in advanced ansible way.


[masters]  openshift_ip= openshift_public_ip= openshift_hostname=ghuang1.cluster.local openshift_public_hostname=ghuang1.cluster.local

[nodes]  openshift_ip= openshift_public_ip= openshift_hostname=ghuang1.cluster.local openshift_public_hostname=ghuang1.cluster.local openshift_schedulable=False  openshift_ip= openshift_public_ip= openshift_hostname=ghuang2.cluster.local openshift_public_hostname=ghuang2.cluster.local openshift_node_labels="{'region': 'primary', 'zone': 'default'}"
2. After installation, check if router pod is created.

Actual results:
After installation, found no router pod is created
3. Check /var/log/message, found anisble installer is setting its replica to 0
Feb  2 05:17:10 localhost ansible-command: Invoked with creates=None executable=None chdir=None args=oadm router --create --replicas=0 --service-account=router --selector='region=primary' --credentials=/etc/origin/master/openshift-router.kubeconfig --images='registry.access.redhat.com/openshift3/ose-${component}:${version}' removes=None NO_LOG=None shell=False warn=True

Expect Result:
1. When no infra nodes found, router should not be created.
2. It is better that ansible ultilize openshift_router_selector to filter nodes for setting router's replica.

Additional info:
Comment 1 Jason DeTiberus 2016-02-02 16:49:37 EST
I've submitted a PR to address this here: https://github.com/openshift/openshift-ansible/pull/1326
Comment 4 Gan Huang 2016-02-14 04:44:13 EST
Verfied with openshift-ansible-3.0.40-1.git.0.cfb19e2.el7aos.noarch
1)When no infra nodes found, router and dc were not created.
2)When infra nodes were configured, and openshift_router_selector='region=infra' router was created successfully
Comment 6 errata-xmlrpc 2016-02-29 07:57:40 EST
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.


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