Luis's Cacho Blog News

Today I Learned

Mon, 21 Nov 2022 00:00:00 +0200

2022 Fantasy Draft

Sun, 28 Aug 2022 18:00:00 +0200

How to test the Openshift Cluster and Machine Autoscaler

Tue, 16 Aug 2022 00:00:00 +0200

oc new-project work-queue
echo 'apiVersion: batch/v1
kind: Job
metadata:
generateName: work-queue-
spec:
template:
spec:
tolerations:
- effect: NoSchedule
key: node-role.kubernetes.io/infra
value: reserved
- effect: NoExecute
key: node-role.kubernetes.io/infra
value: reserved
containers:
- name: work
image: busybox
command: ["sleep", "300"]
resources:
requests:
memory: 2Gi
cpu: 4
restartPolicy: Never
parallelism: 50
completions: 250' | oc create -f - -n work-queue
oc get jobs -n work-queue
oc get pods -n work-queue
oc get machineset -n openshift-machine-api
oc get machines -n openshift-machine-api
oc get nodes
oc delete project work-queue

How to Retrieve secrets values

Tue, 16 Aug 2022 00:00:00 +0200

oc get secret my-secret -n my-project --template={{.data.my-secret-key}} | base64 -d
oc get secret my-secret -n my-project -o go-template --template="{{.data.my-secret-key|base64decode}}"
oc extract secrets/my-secret -n my-project
oc get secret my-secret -n my-project -o jsonpath="{.data['tls\.key']}" | base64 -d

Delete Openshift Project

Tue, 16 Aug 2022 00:00:00 +0200

Issue, can’t delete a namespace/project and is stuck in a “Terminating” status

oc delete project fishbone
oc get projects fishbone
NAME DISPLAY NAME STATUS
fishbone Fishbone Terminating

Solution

Define the namespace/project to delete

export NAMESPACE=fishbone


Cleanup the finalizers section from the namespace definition and define a json file with that
`shell
get namespace $NAMESPACE -o=json | jq '.spec = {"finalizers":[]}' > $NAMESPACE.json
piVersion": "v1",
ind": "Namespace",
etadata": {
nnotations":
penshift.io/description": "",
penshift.io/display-name": "Fishbone",
penshift.io/requester": "system:admin",
penshift.io/sa.scc.mcs": "s0:c24,c14",
penshift.io/sa.scc.supplemental-groups": "1000580000/10000",
penshift.io/sa.scc.uid-range": "1000580000/10000"
reationTimestamp": "2021-02-20T03:29:59Z",
eletionTimestamp": "2021-02-20T03:31:35Z",
ame": "fishbone",
esourceVersion": "270664",
elfLink": "/api/v1/namespaces/fishbone",
id": "885c4440-6f05-4e72-a103-28e61705406f"
pec": {
inalizers": [
ubernetes"
tatus": {
onditions": [
hase": "Terminating"


Apply the json file from the previous step to delete the finalizers and therefore the deletion of the namespace/project
`shell
rl -k -H "authorization: Bearer $(oc whoami --show-token)" -H "Content-Type: application/json" -X PUT --data-binary @$NAMESPACE.json $(oc whoami --show-server)/api/v1/namespaces/$NAMESPACE/finalize


Verify that the namspace/project has been deleted
`shell
get projects $NAMESPACE
ror from server (NotFound): namespaces "fishbone" not found

References:

Kubernetes Advanced Topics¹
Kubernetes Namespace Stuck²
Red Hat article[^3]

How to list the taints on kubernetes nodes

Mon, 15 Aug 2022 00:00:00 +0200

oc get nodes -o json | jq '.items[].spec.taints'
oc get nodes -o json | jq '.items[] | {node_name:.metadata.name,taints:.spec.taints[]?}
oc get nodes -o=custom-columns=NAME:.metadata.name,TAINTS:.spec.taints
get nodes -o=jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.spec.taints}{"\n"}{end}'

References:

¹ StackOverflow

https://stackoverflow.com/questions/43379415/how-can-i-list-the-taints-on-kubernetes-nodes ↩︎

Rules that changed from 2021 to 2022 Season

Thu, 04 Aug 2022 00:00:00 +0200

Table of Contents

Open-Source

Mon, 06 Jun 2022 00:00:00 +0200

2022 Season Overview of Nerd Football League

Fri, 03 Jun 2022 00:00:00 +0200

Table of Contents

Rules

Fri, 03 Jun 2022 00:00:00 +0200

Table of Contents

2021 Fantasy Draft

Sun, 05 Sep 2021 17:00:00 +0200

Create GitLab merge request from cli

Fri, 03 Sep 2021 23:00:00 +0200

Do not push your branch before the following commands. If you push your branch before it will not work. Git response is going to be Everything up-to-date and the merge request will not be created.

Push my-branch to the remote repository and create a new merge request from our branch to the main branch of the project.

git push -o merge_request.create origin my-branch

Push my-branch to the remote repository and the target branch work with the merge request title </code> and a merge request description <code><description></code>, setting the merge request to remove the source branch when it’s merged:</li> </ul> <pre><code class="language-shell">git push \ -o merge_request.create \ -o merge_request.target=work \ -o merge_request.title="<title>" \ -o merge_request.description="<description>" \ origin my-branch </code></pre> <p><strong>References:</strong></p> <ul> <li><sup id="fnref:1"><a href="#fn:1" class="footnote-ref" role="doc-noteref">1</a></sup> GitLab Documentation</li> </ul> <section class="footnotes" role="doc-endnotes"> <hr> <ol> <li id="fn:1" role="doc-endnote"> <p><a href="https://docs.gitlab.com/ee/user/project/push_options.html" target="_blank" rel="noopener">https://docs.gitlab.com/ee/user/project/push_options.html</a> <a href="#fnref:1" class="footnote-backref" role="doc-backlink">↩︎</a></p> </li> </ol> </section> </article> <article> <h1>jq select objects based on a value</h1> <p>Thu, 26 Aug 2021 23:00:00 +0200</p> <ul> <li>Initial json input</li> </ul> <pre><code class="language-json">{ "ACTION": "domain.list", "DATA": [ { "TYPE": "slave", "AXFR_IPS": "none", "DOMAIN": "domain1.com", "TTL_SEC": 0, "SOA_EMAIL": "", "DOMAINID": 11111, "DESCRIPTION": "", "EXPIRE_SEC": 0, "RETRY_SEC": 0, "STATUS": 1, "LPM_DISPLAYGROUP": "", "REFRESH_SEC": 0 }, { "TYPE": "slave", "AXFR_IPS": "none", "DOMAIN": "domain2", "TTL_SEC": 0, "SOA_EMAIL": "", "DOMAINID": 22222, "DESCRIPTION": "", "EXPIRE_SEC": 0, "RETRY_SEC": 0, "STATUS": 1, "LPM_DISPLAYGROUP": "", "REFRESH_SEC": 0 }, { "TYPE": "slave", "AXFR_IPS": "none", "DOMAIN": "domain3", "TTL_SEC": 0, "SOA_EMAIL": "", "DOMAINID": 33333, "DESCRIPTION": "", "EXPIRE_SEC": 0, "RETRY_SEC": 0, "STATUS": 1, "LPM_DISPLAYGROUP": "", "REFRESH_SEC": 0 } ], "ERRORARRAY": [] } </code></pre> <ul> <li>Return the <code>DOMAINID</code> from <code>domain2</code></li> </ul> <pre><code class="language-shell">jq '.DATA[] | select(.DOMAIN == "domain2") | .DOMAINID' 22222 </code></pre> <ul> <li>Return <code>DOMAINID</code> and <code>TYPE</code> from <code>domain2</code></li> </ul> <pre><code class="language-shell">jq '.DATA[] | select(.DOMAIN == "domain2") | .DOMAINID,.TYPE' 22222 "slave" </code></pre> <ul> <li>Return <code>DOMAINID</code>, <code>DOMAIN</code> from <code>domain2</code> and <code>domain3</code></li> </ul> <pre><code class="language-shell">jq '.DATA[] | select(.DOMAIN == ("domain2","domain3")) | .DOMAINID,.DOMAIN' 22222 "slave" 33333 "slave" # or jq '.DATA[] | select(.DOMAIN | IN("domain2", "domain3")) | .DOMAINID,.DOMAIN' 22222 "slave" 33333 "slave" </code></pre> <p><strong>References:</strong></p> <ul> <li><sup id="fnref:1"><a href="#fn:1" class="footnote-ref" role="doc-noteref">1</a></sup> Github Issue</li> </ul> <section class="footnotes" role="doc-endnotes"> <hr> <ol> <li id="fn:1" role="doc-endnote"> <p><a href="https://github.com/stedolan/jq/issues/370" target="_blank" rel="noopener">https://github.com/stedolan/jq/issues/370</a> <a href="#fnref:1" class="footnote-backref" role="doc-backlink">↩︎</a></p> </li> </ol> </section> </article> <article> <h1>OR statement within jq select</h1> <p>Thu, 26 Aug 2021 23:00:00 +0200</p> <ul> <li>Initial json input</li> </ul> <pre><code class="language-json">{ "nodes": [ { "name": "crc-4727w-master-0", "cpu": 75, "memory": 82 }, { "name": "crc-4727w-worker-0", "cpu": 65, "memory": 70 }, { "name": "crc-4727w-worker-1", "cpu": 60, "memory": 68 } ] } </code></pre> <ul> <li>The jq select filter with a comparison <ul> <li>Is going to show the nodes that the cpu usage is greater than 70% OR the memory usage is greater than 90%</li> </ul> </li> </ul> <pre><code class="language-shell">jq '.nodes[] | select(.cpu >=70 or .memory >=90)' </code></pre> <ul> <li>Result</li> </ul> <pre><code class="language-json">{ "name": "crc-4727w-master-0", "cpu": 75, "memory": 82 } </code></pre> </article> <article> <h1>Jinja Loops</h1> <p>Wed, 25 Aug 2021 23:00:00 +0200</p> <ul> <li>Initial example</li> </ul> <pre><code class="language-jinja">{% set count = 1 %} {% for i in p %} {{ count }} {% set count = count + 1 %} {% endfor %} </code></pre> <ul> <li>Ansible example to access each item within the output of a previous command:</li> </ul> <pre><code class="language-yaml">- name: Gather Nodes Status ansible.builtin.command: oc get node {{ item }} -o=jsonpath='{@.metadata.name}{range @.status.conditions[*]}{@.status}{end}' changed_when: false loop: "{{ ocp_nodes.stdout_lines }}" register: ocp_nodes_status </code></pre> <pre><code class="language-jinja">{% set count = 0 %} {% for i in ocp_nodes_status.results | map(attribute='stdout_lines') %} {% for j in ocp_nodes_status.results[count].stdout_lines %} {{ j }} {% endfor %} {% set count = count + 1 %} {% endfor %} </code></pre> </article> <article> <h1>Select and Sum dictionary values selecting a pattern</h1> <p>Tue, 24 Aug 2021 23:00:00 +0200</p> <ul> <li>The Dictionary</li> </ul> <pre><code class="language-yaml">FS: - nom_FS: /appm/oracle/product nom_LV: lv_product size_FS: 5 owner_FS: oracle group_FS: dba vg_name: vgapplis - nom_FS: /appm/oracle/product/12.1.0.2 nom_LV: lv_12102 size_FS: 15 owner_FS: oracle group_FS: dba vg_name: vgapplis - nom_FS: /apps/oracle/logs nom_LV: lvlogs size_FS: 5 owner_FS: oracle group_FS: dba vg_name: vglogs </code></pre> <ul> <li>The ansible tasks</li> </ul> <pre><code class="language-yaml">tasks: - name: Calculate with selectattr, map and sum debug: msg: "{{ FS | selectattr('vg_name', 'equalto', 'vgapplis') | map(attribute='size_FS') | list | sum }}" - name: Calculate with json_query vars: sum_query: "[?vg_name=='vgapplis'].size_FS | sum(@)" debug: msg: "{{ FS | json_query(sum_query) }}" </code></pre> <p><strong>References:</strong></p> <ul> <li><sup id="fnref:1"><a href="#fn:1" class="footnote-ref" role="doc-noteref">1</a></sup> Use select and map with Ansible</li> </ul> <section class="footnotes" role="doc-endnotes"> <hr> <ol> <li id="fn:1" role="doc-endnote"> <p><a href="https://serverfault.com/questions/972403/use-select-and-map-with-ansible" target="_blank" rel="noopener">https://serverfault.com/questions/972403/use-select-and-map-with-ansible</a> <a href="#fnref:1" class="footnote-backref" role="doc-backlink">↩︎</a></p> </li> </ol> </section> </article> <article> <h1>Register nickname in IRC</h1> <p>Mon, 23 Aug 2021 23:00:00 +0200</p> <pre><code class="language-shell">/msg NickServ info /msg NickServ register password email-address /msg NickServ VERIFY REGISTER nickname secret-password /msg NickServ info </code></pre> </article> <article> <h1>Shortcuts for a Keychron K8 keyboard</h1> <p>Sun, 22 Aug 2021 23:00:00 +0200</p> <ul> <li>Change light effect</li> </ul> <pre><code class="language-shell">Press fn + right arrow/left arroe to change color </code></pre> <ul> <li>Disable Auto Sleep Mode</li> </ul> <pre><code class="language-shell">Press fn + S + O </code></pre> <p><strong>References:</strong></p> <ul> <li><sup id="fnref:1"><a href="#fn:1" class="footnote-ref" role="doc-noteref">1</a></sup>Keychron K8 Keyboard User Manual</li> </ul> <section class="footnotes" role="doc-endnotes"> <hr> <ol> <li id="fn:1" role="doc-endnote"> <p><a href="https://drive.google.com/file/d/1g9perUDrRI10L7MhHP31MD_ZtpPiHGOd/view?usp=sharing" target="_blank" rel="noopener">https://drive.google.com/file/d/1g9perUDrRI10L7MhHP31MD_ZtpPiHGOd/view?usp=sharing</a> <a href="#fnref:1" class="footnote-backref" role="doc-backlink">↩︎</a></p> </li> </ol> </section> </article> <article> <h1>Ansible Environment variables</h1> <p>Thu, 19 Aug 2021 23:00:00 +0200</p> <pre><code class="language-yaml">- hosts: localhost vars: kubeconfig_path: "{{ lookup('env','KUBECONFIG') }}" cloudflare_email: "{{ lookup('env','CF_EMAIL') }}" </code></pre> <pre><code class="language-shell">export CF_EMAIL=<your_cloudflare_email> export KUBECONFIG=~/.kube/config ansible-playbook playbook.yml </code></pre> <p><strong>References:</strong></p> <ul> <li><sup id="fnref:1"><a href="#fn:1" class="footnote-ref" role="doc-noteref">1</a></sup>How to Inject Environment Variables into Ansible Playbooks</li> </ul> <section class="footnotes" role="doc-endnotes"> <hr> <ol> <li id="fn:1" role="doc-endnote"> <p><a href="https://graspingtech.com/ansible-environment-variables/" target="_blank" rel="noopener">https://graspingtech.com/ansible-environment-variables/</a> <a href="#fnref:1" class="footnote-backref" role="doc-backlink">↩︎</a></p> </li> </ol> </section> </article> <article> <h1>Change the field separator in awk</h1> <p>Thu, 19 Aug 2021 23:00:00 +0200</p> <pre><code class="language-shell">awk -F ":" '{print $1}' # or if you want to do it programatically awk 'BEGIN { FS=":" } { print $1 }' # or you can also use a regular expression as a field separator. # The following will print "bar" by using a regular expression to set the number "10" as a separator. echo "foo 10 bar" | awk -F'[0-9][0-9]' '{print $2}' </code></pre> </article> </main></body></html>