Digital-Garden | Luis Cacho

Asciidoc: Span Cell over Rows and Columns

Fri, 27 Oct 2023 00:00:00 +0000

== Table cell span

.Cell spans columns
|===
| Name | Description

| Asciidoctor

| Awesome way to write documentation

// This cell spans 2 columns, indicated
// by the number before the + sign.
// The + sign
// tells Asciidoctor to span this
// cell over multiple columns.
2+| The statements above say it all

|===

.Cell spans rows
|===
| Name | Description

// This cell spans 2 rows,

// because the number after
// the dot (.) specifies the number
// of rows to span. The + sign
// tells Asciidoctor to span this
// cell over multiple rows.
.2+| Asciidoctor
| Awesome way to write documentation

| Works on the JVM

|===

.Cell spans both rows and columns
|===
| Col1 | Col2 | Col 3

// We can combine the numbers for
// row and column span within one
// cell specifier.
// The number before the dot (.)
// is the number of columns to span,
// the number after the dot (.)
// is the number of rows to span.
2.2+| Cell spans 2 cols, 2 rows
| Row 1, Col 3
| Row 2, Col 3

|===

Asciidoc Table Cell Span

![[table-cell-span.png]]

References:

¹Awesome Asciidoctor: Span Cell over Rows and Columns

Awesome Asciidoctor: Span Cell over Rows and Columns ↩︎

cURL to a specific target hostname

Fri, 23 Jun 2023 00:00:00 +0000

# Mockup command
curl -kv -H "Host: <target hostname>" <protocol>://<server ip address>:<port>

# Example command
curl -kv -H "Host: myapp.apps.example.com" https://152.10.10.1:443

Fix a borg lock issue

Fri, 23 Jun 2023 00:00:00 +0000

When you get the error:

# Example command

# ERROR output
borg info ssh://asdbqw55@a3rbqwrx.repo.borg.com/./repo
Enter passphrase for key ssh://asdbqw55@a3rbqwrx.repo.borg.com/./repo:
Failed to create/acquire the lock /Users/lcacho/.cache/borg/34961807af9e356640e09e9973ef4664598ee6706e4c2bccc4b2770c15e09d2b/lock.exclusive (timeout).

# Fix
borg break-lock ssh://asdbqw55@a3rbqwrx.repo.borg.com/./repo

References:

¹ Borg Break Lock

https://borgbackup.readthedocs.io/en/stable/usage/lock.html#borg-break-lock ↩︎

How to find the last element in an array using jsonpath

Thu, 22 Jun 2023 00:00:00 +0000

- name: Get Operator StartingCSV - {{ operator_name }}
 command: oc get packagemanifest {{ operator_name }} -n openshift-marketplace -o jsonpath='{.status.channels[-1:].currentCSV}'
 changed_when: false
 register: reg_operator_csv

Populate an Ansible Fact from a loop

Thu, 22 Jun 2023 00:00:00 +0000

tasks:
 - name: Get list of elements from list_vars
 set_fact:
 my_new_list: "{{ my_new_list | default([]) | union([item]) }}"
 loop: "{{ list_vars }}"

 - name: Get list of elements from list_vars 
 set_fact:
 my_new_list: "{{ my_new_list | default([]) + [item] }}"
 loop: "{{ list_vars }}"

Python Alternatives in RHEL based OS

Thu, 22 Jun 2023 00:00:00 +0000

# To configure the unversioned `python` command to Python 3.11

alternatives --set python /usr/bin/python3.11

# To configure the unversioned `python` command to Python 2

alternatives --set python /usr/bin/python2

References:

¹Configure python on RHEL8

https://access.redhat.com/solutions/5380941 ↩︎

Trigger a scheduled job manually on Kubernetes

Thu, 22 Jun 2023 00:00:00 +0000

# Mockup command
kubectl create job --from=cronjob/<cronjob-name> <job-name> -n <namespace-name>

References:

¹How can I trigger a Kubernetes Scheduled Job manually?

https://stackoverflow.com/questions/40401795/how-can-i-trigger-a-kubernetes-scheduled-job-manually ↩︎

Update all the git submodules

Thu, 22 Jun 2023 00:00:00 +0000

# Example command
git submodule foreach git pull

References:

¹How to update submodules in git?

https://stackoverflow.com/questions/33714063/how-to-update-submodules-in-git ↩︎

Sum numbers over loop

Tue, 29 Nov 2022 00:00:00 +0000

- set_fact:
 total: "{{ total|default(0)|int + item|int }}"
 loop:
 - 1
 - 4
 - 3

- debug: var=total

References:

¹ Sum numbers over loop

https://stackoverflow.com/questions/50543108/ansible-can-i-sum-numbers-over-loop ↩︎

Delete Evicted Pods

Wed, 23 Nov 2022 00:00:00 +0000

oc get pods | grep Evicted | awk '{print $1}' | xargs kubectl delete pod

References:

¹ Gist

https://gist.github.com/ipedrazas/9c622404fb41f2343a0db85b3821275d ↩︎

ArgoCD cli login command

Wed, 17 Aug 2022 00:00:00 +0000

argocd login \
--insecure \
--grpc-web $(oc get route openshift-gitops-server -n openshift-gitops
-o jsonpath='{.spec.host}{"\n"}') \
--username admin \
--password $(oc get secret/openshift-gitops-cluster -n openshift-gitops -o jsonpath='{.data.admin\.password}' | base64 -d)

Delete OpenShift Operator

Mon, 15 Aug 2022 00:00:00 +0000

# Mockup commands

oc get subscription <operator> -n openshift-operators -o yaml | grep
currentCSV

oc delete subscription <operator> -n openshift-operators

oc delete clusterserviceversion <currentCSV> -n openshift-operators

# Example commands

oc get subscription jaeger -n openshift-operators -o yaml | grep currentCSV

oc delete subscription jaeger -n openshift-operators

oc delete clusterserviceversion jaeger-operator.v1.8.2 -n openshift-operators

Delete OpenShift Project

Mon, 15 Aug 2022 00:00:00 +0000

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

oc get namespace $NAMESPACE -o=json | jq '.spec = {"finalizers":[]}' > $NAMESPACE.json
{
 "apiVersion": "v1",
 "kind": "Namespace",
 "metadata": {
 "annotations":
 "openshift.io/description": "",
 "openshift.io/display-name": "Fishbone",
 "openshift.io/requester": "system:admin",
 "openshift.io/sa.scc.mcs": "s0:c24,c14",
 "openshift.io/sa.scc.supplemental-groups": "1000580000/10000",
 "openshift.io/sa.scc.uid-range": "1000580000/10000"
 },
 "creationTimestamp": "2021-02-20T03:29:59Z",
 "deletionTimestamp": "2021-02-20T03:31:35Z",
 "name": "fishbone",
 "resourceVersion": "270664",
 "selfLink": "/api/v1/namespaces/fishbone",
 "uid": "885c4440-6f05-4e72-a103-28e61705406f"
 },
 "spec": {
 "finalizers": [
 "kubernetes"
 ]
 },
 "status": {
 "conditions": [
 .
 .
 .
 ],
 "phase": "Terminating"
}

Apply the json file from the previous step to delete the finalizers and therefore the deletion of the namespace/project

curl -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

oc get projects $NAMESPACE
Error from server (NotFound): namespaces "fishbone" not found

References:

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

How to Retrieve secrets values

Mon, 15 Aug 2022 00:00:00 +0000

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

How to test the OpenShift Cluster and Machine Autoscaler

Mon, 15 Aug 2022 00:00:00 +0000

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 list the taints on kubernetes nodes

Sun, 14 Aug 2022 00:00:00 +0000

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 ↩︎

OpenID autodiscovery URL integration in OpenShift

Mon, 23 May 2022 00:00:00 +0000

# Discover the available URLs from your autodiscovery URL
curl https://<idp_host>/.well-known/openid-configuration

CLIENT_SECRET=$(oc get secret -n openshift-config my-id-secret my-id-secret -o jsonpath='{.items[0].data.clientSecret}' | base64 -D)

curl -s -X POST https://<idp_host>/idp/userinfo.openid -H 'content-type: application/x-www-form-urlencoded' -d "client_id=ocp4testawsuswest2QA&client_secret=${CLIENT_SECRET}&access_token=${ACCESS_TOKEN}" | jq

References: - ¹ https://access.redhat.com/solutions/4605141

https://access.redhat.com/solutions/4605141 ↩︎

Delete a Job in Nomad

Sun, 17 Apr 2022 00:00:00 +0000

# Stop and Purge
nomad job stop -purge <job-name>

# Clean Garbage Collector
nomad system gc

References:

¹ How to remove a job in Nomad

https://discuss.hashicorp.com/t/how-to-remove-a-job-in-nomad/26354/2 ↩︎

Ansible variable with dot in name

Wed, 09 Mar 2022 00:00:00 +0000

Given the next variable outoput, we want to get the value for user_namespace.enable

- debug:
 msg: "{{ ansible_cmdline }}"

Give us:

"msg": {
 "BOOT_IMAGE": "/vmlinuz-...",
 "LANG": "...",
 "crashkernel": "...",
 "namespace.unpriv_enable": "...",
 "quiet": ...,
 "rd.lvm.lv": "...",
 "rhgb": ...,
 "ro": ...,
 "root": "...",
 "user_namespace.enable": "1"
}

To access it we need to do:

- debug:
 msg: "{{ ansible_cmdline['user_namespace.enable'] }}"

References:

¹ Stackoverflow solution
² Ansible Documentation

Change author email in commit

Tue, 30 Nov 2021 00:00:00 +0000

Just works in the last commit

git commit --amend --author="John Doe <john@doe.org>"

References:

¹How can I change the author (name / email) of a commit?

https://www.git-tower.com/learn/git/faq/change-author-name-email ↩︎

vim settings for YAML files

Mon, 04 Oct 2021 00:00:00 +0000

set ts=2
set sts=2
set sw=2
set expandtab

syntax on
filetype indent plugin on

set ruler

References:

¹Vim Settings for YAML

https://www.krenger.ch/blog/vim-settings-for-yaml-files/ ↩︎

Replace NaN Values with Zeros in Pandas DataFrame

Sun, 26 Sep 2021 00:00:00 +0000

import pandas as pd

df = pd.DataFrame({'values_1': [700, np.nan, 500, np.nan],
 'values_2': [np.nan, 150, np.nan, 400]
 })
df = df.fillna(0)

print(df)

 values_1 values_2
0 700.0 0.0
1 0.0 150.0
2 500.0 0.0
3 0.0 400.0

References:

¹ Replace NaN Values with Zeros in Pandas DataFrame

https://datatofish.com/replace-nan-values-with-zeros/ ↩︎

Create a Pandas DataFrame from a Dict

Wed, 22 Sep 2021 00:00:00 +0000

import pandas as pd

data = {'name': ['Nick', 'David', 'Joe', 'Ross'],
 'age': ['5', '10', '7', '6']}
new = pd.DataFrame.from_dict(data)

new
 name age
0 nick 5
1 david 10
2 joe 7
3 ross 6

References:

¹How to convert Dictionary to Pandas Dataframe?

https://www.geeksforgeeks.org/how-to-convert-dictionary-to-pandas-dataframe/ ↩︎

Create a Pandas DataFrame from a List

Wed, 22 Sep 2021 00:00:00 +0000

import pandas as pd

data = [['Nick',5],['David',10],['Joe',7],['Ross',6]]

new = pd.DataFrame(data, columns=['Name','Age'])

new
 Name Age
0 Nick 5
1 David 10
2 Joe 7
3 Ross 6

References:

¹Convert a List to Dataframe in Python

https://datatofish.com/list-to-dataframe/ ↩︎

How to access an OpenShift 4 Node

Thu, 16 Sep 2021 00:00:00 +0000

In order to review the underline node, you need to follow the next steps:

Get the node name that is having issues or your need to login

oc get nodes

Run the oc debug command into the node

oc debug node/ip-10-0-129-255.us-east-2.compute.internal

Once you are logged in the node, you’ll need to run:

chroot /host

References:

¹ OCP4 Documentation

https://docs.openshift.com/container-platform/4.10/support/gathering-cluster-data.html#support-collecting-network-trace_gathering-cluster-data ↩︎

Create GitLab merge request from cli

Fri, 03 Sep 2021 00:00:00 +0000

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 <title> and a merge request description <description>, setting the merge request to remove the source branch when it’s merged:

git push \
 -o merge_request.create \
 -o merge_request.target=work \
 -o merge_request.title="<title>" \
 -o merge_request.description="<description>" \
 origin my-branch

References:

¹ GitLab Documentation

https://docs.gitlab.com/ee/user/project/push_options.html ↩︎

jq select objects based on a value

Thu, 26 Aug 2021 00:00:00 +0000

Initial json input

{
 "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": []
}

Return the DOMAINID from domain2

jq '.DATA[] | select(.DOMAIN == "domain2") | .DOMAINID'
22222

Return DOMAINID and TYPE from domain2

jq '.DATA[] | select(.DOMAIN == "domain2") | .DOMAINID,.TYPE'
22222
"slave"

Return DOMAINID, DOMAIN from domain2 and domain3

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"

References:

¹ Github Issue

https://github.com/stedolan/jq/issues/370 ↩︎

OR statement within jq select

Thu, 26 Aug 2021 00:00:00 +0000

Initial json input

{
 "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
 }
 ]
}

The jq select filter with a comparison
- Is going to show the nodes that the cpu usage is greater than 70% OR the memory usage is greater than 90%

jq '.nodes[] | select(.cpu >=70 or .memory >=90)'

Result

{
 "name": "crc-4727w-master-0",
 "cpu": 75,
 "memory": 82
}

Jinja Loops

Wed, 25 Aug 2021 00:00:00 +0000

Initial example

{% set count = 1 %}
{% for i in p %}
 {{ count }}
 {% set count = count + 1 %}
{% endfor %}

Ansible example to access each item within the output of a previous command:

- 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

{% 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 %}

Select and Sum dictionary values selecting a pattern

Tue, 24 Aug 2021 00:00:00 +0000

The Dictionary

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

The ansible tasks

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) }}"

References:

¹ Use select and map with Ansible

https://serverfault.com/questions/972403/use-select-and-map-with-ansible ↩︎

Register nickname in IRC

Mon, 23 Aug 2021 00:00:00 +0000

/msg NickServ info
/msg NickServ register password email-address
/msg NickServ VERIFY REGISTER nickname secret-password
/msg NickServ info

Shortcuts for a Keychron K8 keyboard

Sun, 22 Aug 2021 00:00:00 +0000

Change light effect

Press fn + right arrow/left arrow to change color

Disable Auto Sleep Mode

Press fn + S + O

References:

¹Keychron K8 Keyboard User Manual

https://drive.google.com/file/d/1g9perUDrRI10L7MhHP31MD_ZtpPiHGOd/view?usp=sharing ↩︎

Ansible Environment variables

Thu, 19 Aug 2021 00:00:00 +0000

- hosts: localhost
 vars:
 kubeconfig_path: "{{ lookup('env','KUBECONFIG') }}"
 cloudflare_email: "{{ lookup('env','CF_EMAIL') }}"

export CF_EMAIL=<your_cloudflare_email>
export KUBECONFIG=~/.kube/config
ansible-playbook playbook.yml

References:

¹How to Inject Environment Variables into Ansible Playbooks

https://graspingtech.com/ansible-environment-variables/ ↩︎

Change the field separator in awk

Thu, 19 Aug 2021 00:00:00 +0000

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}'

Get variable types in Python

Wed, 11 Aug 2021 00:00:00 +0000

print(type(variable_name))

Update local branch with upstream content

Wed, 11 Aug 2021 00:00:00 +0000

cd $working_dir
git fetch upstream
git checkout main
git rebase upstream/main

ansible-docs

Tue, 10 Aug 2021 00:00:00 +0000

ansible-doc -t <plugin type> -l
ansible-doc inventory -l
ansible-doc -t inventory host_list

ansible-inventories

Tue, 10 Aug 2021 00:00:00 +0000

ansible-inventory -i <inventory file> --host_list
ansible-inventory --yaml -i <inventory file> --list --output inventory.yaml

Print variable results

Tue, 10 Aug 2021 00:00:00 +0000

- name: Print output from a variable results using jinja
 debug:
 msg: "{% for result in ocp_etcd_cert_file.results %}
 {{ result.stdout }}
 {% endfor %}"

- name: Another way to print a variable results
 debug:
 msg: "{{ ocp_etcd_cert_file.results | map(attribute='stdout') | list }}"

Delete git submodule

Sun, 08 Aug 2021 00:00:00 +0000

git submodule deinit -f -- <name_of_submodule>
rm -rf .git/modules/<name_of_submodule>
# Note: The <name_of_submodule> shouldn't have the trailing slash
git rm -f <name_of_submodule>

git commit -m "Deleted submodule xyz"

Example

git submodule deinit -f -- a/submodule
rm -rf .git/modules/a/submodule
git rm -f a/submodule
git commit -m "Deleted submodule a/submodule"

References:

¹How do I remove a submodule?

https://stackoverflow.com/questions/1260748/how-do-i-remove-a-submodule#1260982 ↩︎

Get ServiceAccount token for MTC

Fri, 06 Aug 2021 00:00:00 +0000

oc sa get-token migration-operator -n openshift-migration

MySQL Database Size

Fri, 06 Aug 2021 00:00:00 +0000

SELECT table_schema AS "Database",
ROUND(SUM(data_length + index_length) / 1024 / 1024, 2) AS "Size (MB)"
FROM information_schema.TABLES
GROUP BY table_schema;

Change Rackspace Cloud Load Balancer timeout

Thu, 05 Aug 2021 00:00:00 +0000

Get an Auth-Token

curl -i -d \
 '{ "auth":
 { "RAX-KSKEY:apiKeyCredentials":
 {
 "username": "luiscachog",
 "apiKey": "API-KEY"
 }
 }
 }' -H 'Content-Type: application/json' \
 https://identity.api.rackspacecloud.com/v2.0/tokens

With the Auth-Token get details of the CLB

curl -i -H 'X-Auth-Token: AUTH-TOKEN' -H 'Accept: application/json' \
https://DATACENTER.loadbalancers.api.rackspacecloud.com/v1.0/ACCOUNT_ID/loadbalancers/CLOUD_LOAD_BALANCER_ID

Update the timeout parameter:

curl -i -d \
 '{ "loadBalancer":
 {
 "timeout" : "120"
 }
 }' \
 -H 'X-Auth-Token: AUTH-TOKEN' \
 -H 'Content-Type: application/json' \
 -X PUT \
 https://DATACENTER.loadbalancers.api.rackspacecloud.com/v1.0/ACCOUNT_ID/loadbalancers/CLOUD_LOAD_BALANCER_ID

Command to perform a curl to a PodIP

Thu, 05 Aug 2021 00:00:00 +0000

curl $(oc get pod <pod-name> --template '{{ .status.podIP}}):8080

Approve pending CSRs in OpenShift

Wed, 04 Aug 2021 00:00:00 +0000

for id in $(oc get csr | grep Pending | awk '{print $1}'); do oc adm certificate approve $id; done

Create a Nooba Object Bucket Claim

Wed, 04 Aug 2021 00:00:00 +0000

noobaa obc create myobc

 oc get obc
 oc get obc myobc -o yaml
 oc get -n openshift-storage secret myobc -o yaml
 oc get -n openshift-storage cm myobc -o yaml

The ConfigMap and the Secret have the same name as the OBC.
The ConfigMap contains the S3 endpoint information for your application, and the Secret provides you with the S3 access credentials.

Debug DNS using TCPDump

Wed, 04 Aug 2021 00:00:00 +0000

tcpdump -xx -vvvv -s 0 -l -n -i any port 53 -w test.pcap

pfsense-tunning

Tue, 03 Aug 2021 00:00:00 +0000

Edit /boot/loader.conf.local

kern.ipc.nmbclusters="131072"
kern.ipc.nmbjumbo9="65536"

Using pftop

Tue, 03 Aug 2021 00:00:00 +0000

 pftop -S1 -v queue

References:

pfSense Traffic Shaping Guide¹

pfSense Traffic Shaping Guide ↩︎

Get OpenShift Console URL

Mon, 02 Aug 2021 00:00:00 +0000

oc whoami --show-console

oc -n openshift-console get routes

Relaunch docker-compose deployment with a new image

Mon, 02 Aug 2021 00:00:00 +0000

docker-compose pull && docker-compose -f docker-compose.yml up -d

Restart an Istio deployment

Mon, 02 Aug 2021 00:00:00 +0000

Error:

MountVolume.SetUp failed for volume "istiod-ca-cert" : configmap "istio-ca-root-cert" not found

Fix:

kubectl rollout restart deployment istiod -n istio-system

AIX Tunning commands

Sun, 01 Aug 2021 00:00:00 +0000

no -a > no.txt
vmo -L > vmo.txt
ioo -L > ioo.txt

Ceph commands

Sun, 01 Aug 2021 00:00:00 +0000

 ceph status
 ceph osd crush tree

Istio debug commands

Sun, 01 Aug 2021 00:00:00 +0000

Istio Pods

kubectl get pods -n istio-system

Istio Logs

kubectl logs -n istio-system -l app=istiod

Istio Analize

istioctl analyze

Istio Proxy Status

istioctl proxy-status

Kubernetes debug commands

Sun, 01 Aug 2021 00:00:00 +0000

Kubernetes error messages

kubectl get events -n kube-system

Kubernetes pods logs

stern prox -n kube-system

Debug with busybox

kubectl run --generator=run-pod/v1 -i --tty busybox --image=busybox --restart=Never -- sh

CodeReady Containers commands

Tue, 20 Jul 2021 00:00:00 +0000

crc config view # View Actual config
crc config set autostart-tray false # Disable autostart
crc config set consent-telemetry false # Disable telemetry
crc config set enable-cluster-monitoring true # Enable Monitoring, needs more memory
crc config set host-network-access true # Enable TCP/IP connections
crc config set kubeadmin-password $MY_PASSW0RD # Define my own kubeadmin-password
crc config set memory 14336 # Increase Memory to 14GB
crc config set pull-secret-file $PATH_TO_PULL_SECRET_FILE # Path to a pull-secret file (download from https://cloud.redhat.com/openshift/create/local)
crc setup
crc start
crc ip
crc stop

Upload Image to a Registry with Podman

Tue, 20 Jul 2021 00:00:00 +0000

sudo podman pull docker.io/library/alpine
sudo podman push docker.io/library/alpine --tls-verify=false <KUBE_REGISTRY_ROUTE>/alpine

Wait for pod to be ready

Thu, 15 Jul 2021 00:00:00 +0000

export POD_NAME=hello-d8d8d7455-j9nzw
while [[ $(oc get pods $POD_NAME -o 'jsonpath={..status.conditions[?(@.type=="Ready")].status}') != "True" ]]; do echo "waiting for pod" && sleep 1; done

If you want to wait until all the pods with a common label you can do:

while [[ $(kubectl get pods -l app=hello -o 'jsonpath={..status.conditions[?(@.type=="Ready")].status}') != "True" ]]; do echo "waiting for pod" && sleep 1; done