devops

install instructons is here https://linoxide.com/linux-how-to/setup-openshift-origin-centos-7/

this is my first project for devops

oc command not found error on other placess and you have to use only ./oc to fid this please run below command from your oc home path

ex:sudo ln -s /home/rajesh/openshift/oc /bin/oc

INSTALL OPENSHIFT ORGIEN AFTER LOGIN USING OC COMMAND YOU WILL SEE SOME ERROR LIKE
error YOU WILL GET LIKE BELOW : ./oc login -u system:admin

[root@master openshift]# ./oc login -u system:admin Authentication required for https://192.168.0.28:8443 (openshift) Username: system:admin Password: error: username system:admin is invalid for basic auth - verify you have provided the correct host and port and that the server is currently running. error: username system:admin is invalid for basic auth

TO FIX PLESAE USBE BELOW STEPS

1. FIND OUT admin.kubeconfig file shuld be /openshift home / openshift.local.config/master/admin.kubeconfig easy way to find use "locate admin.kubeconfig" ex : /home/rajesh/openshift/openshift.local.config/master/admin.kubeconfig

if your not able to find that admin.kubeconfig / ~/.kube then it will be hidden in your openshift directory where your "oc" command is there

or try to run this command it will show paths of that file

./oadm diagnostics

2. now exprot that path export KUBECONFIG=/home/rajesh/openshift/openshift.local.config/master/admin.kubeconfig

3. now run your oc command ./oc login -u system:admin

(it will login this time without any password )

system:admin credentials live in a client certificate. If you get prompted for a password, that means your $KUBECONFIG file does not contain those credentials. You need to locate the admin.kubeconfig file generated at server start and do export KUBECONFIG=/path/to/admin.kubeconfig

Then you will be able to run cluster admin commands.

to test login as ./oc login -u system:admin if you still asking password then you need add .kube config file where you have all user info exmaple : https://kubernetes.io/docs/concepts/configuration/organize-cluster-access-kubeconfig/

like here ; export KUBECONFIG=$KUBECONFIG:/home/rajesh/.kube/config

this should deferently fix your issue now your able to login without any issues "oc login -u system:admin "

================================================= common errors (background i have installed docker then openshift orgine its not working so i copied downloaded openshift tar to another location and started its working but its not integrated with docker i need to trobleshoot this one )

error: when i run oc status command as devloper to list projects
erors:

• bc/myapp is pushing to istag/myapp:latest, but the administrator has not configured the integrated Docker registry.
• route/jenkins is routing traffic to svc/jenkins, but either the administrator has not installed a router or the router is not selecting this route.

4. after install you wont get templete on login screen to fix this please fallow below steps

https://docs.openshift.org/latest/install_config/imagestreams_templates.html

You must have cloned the repository that contains the default image streams and templates: 1.1 download openshift-ansible templet files for db / other temptlets be a root user and fallow below steps $ cd ~ $ git clone https://github.com/openshift/openshift-ansible

1.2 now export those files ocne its downoad

$ IMAGESTREAMDIR=/openshift-ansible/roles/openshift_examples/files/examples/v3.6/image-streams;
DBTEMPLATES=/openshift-ansible/roles/openshift_examples/files/examples/v3.6/db-templates;
QSTEMPLATES=~/openshift-ansible/roles/openshift_examples/files/examples/v3.6/quickstart-templates

1.3 $ oc create -f $IMAGESTREAMDIR/image-streams-rhel7.json -n openshift $ oc create -f $DBTEMPLATES -n openshift $ oc create -f $QSTEMPLATES -n openshift

1.4 logout if your already login to webconsole and log back in now you will able to see all templets on screen dashboard

2.1 some times if you install docker then openshfit orgivne and delete orgivne and download tar or copy tar to diffrent folder and try to start it will start but it wont integrate with docker you will somehting like below errors , and deployment wont happend and pods wont create ,

Errors:

• bc/myapp is pushing to istag/myapp:latest, but the administrator has not configured the integrated Docker registry.
• route/jenkins is routing traffic to svc/jenkins, but either the administrator has not installed a router or the router is not selecting this route.
• route/myapp is routing traffic to svc/myapp, but either the administrator has not installed a router or the router is not selecting this route.

4.1 if you seen any errors related to registry 1 place to look you might missed to add insecure-registry like to docker file if that one also not worked try this below one

https://blog.hostonnet.com/did-not-detect-insecure-registry-argument-docker-daemon

/etc/default/docker, added line 1

DOCKER_OPTS="--insecure-registry 172.30.0.0/16"

But for some reason, docker will not take this after i restart.

This is fixed by editing systemd unit for docker at 1

vi /etc/systemd/system/multi-user.target.wants/docker.service

Find 1

/usr/bin/dockerd -H fd://

Replace with 1

/usr/bin/dockerd --insecure-registry 172.30.0.0/16 -H fd://

Now reload systemd 1

systemctl daemon-reload

Restart docker 1 2

systemctl stop docker systemctl start docker