Openshift 节点添加和删除

1.节点添加

在新节点上编辑yum源/etc/yum.repo.d/ocp.repo

/etc/hosts在主和节点上都加上相应信息

编辑host文件，加入

[OSEv3:children]
masters
nodes
etcd
new_nodes
 
[new_nodes]
node3.example.com openshift_node_group_name='node-config-compute'

然后运行

cd /usr/share/ansible/openshift-ansible
ansible-playbook  playbooks/openshift-node/scaleup.yml

机器资源不够，添加到最后审批阶段不通过，一看master 8443端口都不响应了,去掉infra节点后再来居然可以了。：-(

TASK [Approve node certificates when bootstrapping] *****************************************************************************************************
Monday  December   :: + (::00.416)       ::43.233 *******
FAILED - RETRYING: Approve node certificates when bootstrapping ( retries left).
FAILED - RETRYING: Approve node certificates when bootstrapping ( retries left).
FAILED - RETRYING: Approve node certificates when bootstrapping ( retries left).
FAILED - RETRYING: Approve node certificates when bootstrapping ( retries left).
FAILED - RETRYING: Approve node certificates when bootstrapping ( retries left).
FAILED - RETRYING: Approve node certificates when bootstrapping ( retries left).
FAILED - RETRYING: Approve node certificates when bootstrapping ( retries left).
FAILED - RETRYING: Approve node certificates when bootstrapping ( retries left).
FAILED - RETRYING: Approve node certificates when bootstrapping ( retries left).

PLAY RECAP **********************************************************************************************************************************************
localhost                  : ok=   changed=    unreachable=    failed=
master.example.com         : ok=   changed=    unreachable=    failed=
node3.example.com          : ok=  changed=   unreachable=    failed=   
 
INSTALLER STATUS ****************************************************************************************************************************************
Initialization              : Complete (::)
Node Bootstrap Preparation  : Complete (::)
Node Join                   : Complete (::)

Monday 03 December 2018 16:51:24 +0800 (0:00:00.471) 0:10:22.945 *******
===============================================================================
Approve node certificates when bootstrapping --------------------------------------------------------------------------------------------------- 185.53s
Run variable sanity checks ---------------------------------------------------------------------------------------------------------------------- 55.58s
Gathering Facts --------------------------------------------------------------------------------------------------------------------------------- 53.54s
container_runtime : Fixup SELinux permissions for docker ---------------------------------------------------------------------------------------- 22.34s
get openshift_current_version -------------------------------------------------------------------------------------------------------------------- 8.66s
Detecting Operating System from ostree_booted ---------------------------------------------------------------------------------------------------- 8.30s
Gather Cluster facts ----------------------------------------------------------------------------------------------------------------------------- 7.91s
openshift_sanitize_inventory : Check for usage of deprecated variables --------------------------------------------------------------------------- 7.17s
openshift_sanitize_inventory : set_stats --------------------------------------------------------------------------------------------------------- 4.83s
Ensure openshift-ansible installer package deps are installed ------------------------------------------------------------------------------------ 4.74s
openshift_node : Update journald setup ----------------------------------------------------------------------------------------------------------- 4.05s
openshift_sanitize_inventory : include_tasks ----------------------------------------------------------------------------------------------------- 3.85s
Initialize openshift.node.sdn_mtu ---------------------------------------------------------------------------------------------------------------- 3.66s
openshift_manage_node : Wait for sync DS to set annotations on all nodes ------------------------------------------------------------------------- 3.41s
tuned : Ensure files are populated from templates ------------------------------------------------------------------------------------------------ 3.12s
set_fact openshift_portal_net if present on masters ---------------------------------------------------------------------------------------------- 2.79s
Gathering Facts ---------------------------------------------------------------------------------------------------------------------------------- 2.76s
openshift_manage_node : Set node schedulability -------------------------------------------------------------------------------------------------- 2.54s
openshift_sanitize_inventory : include_tasks ----------------------------------------------------------------------------------------------------- 2.54s
tuned : Restart tuned service -------------------------------------------------------------------------------------------------------------------- 2.45s

[root@master openshift-ansible]# oc get nodes
NAME                 STATUS     ROLES     AGE       VERSION
master.example.com   Ready      master    3d        v1.11.0+d4cacc0
node1.example.com    NotReady   infra     3d        v1.11.0+d4cacc0
node2.example.com    Ready      compute   3d        v1.11.0+d4cacc0
node3.example.com    Ready      compute   16m       v1.11.0+d4cacc0

2.删除节点

目前已经调度的pod

[root@master openshift-ansible]# oc get pods --all-namespaces -o wide | grep node3
openshift-monitoring                node-exporter-r2qrs                            /       Running                      17m       192.168.56.106   node3.example.com    <none>
openshift-node                      sync-n4c7l                                     /       Running                      17m       192.168.56.106   node3.example.com    <none>
openshift-sdn                       ovs-jnqjc                                      /       Running                      17m       192.168.56.106   node3.example.com    <none>
openshift-sdn                       sdn-cc8zb                                      /       Running                      17m       192.168.56.106   node3.example.com    
<none>

也可以通过

[root@master openshift-ansible]# oc adm manage-node node3.example.com --list-pods
 
Listing matched pods on node: node3.example.com
 
NAMESPACE              NAME                  READY     STATUS    RESTARTS   AGE
openshift-monitoring   node-exporter-r2qrs   /       Running             18m
openshift-node         sync-n4c7l            /       Running             18m
openshift-sdn          ovs-jnqjc             /       Running             18m
openshift-sdn          sdn-cc8zb             /       Running             18m

禁止调度

oc adm cordon node3.example.com

驱逐pod

[root@master openshift-ansible]# oc adm drain node3.example.com --force=true
node/node3.example.com already cordoned
error: unable to drain node "node3.example.com", aborting command...
 
There are pending nodes to be drained:
 node3.example.com
error: DaemonSet-managed pods (use --ignore-daemonsets to ignore): node-exporter-r2qrs, sync-n4c7l, ovs-jnqjc, sdn-cc8zb

删除节点

[root@master openshift-ansible]# oc delete nodes node3.example.com
node "node3.example.com" deleted