As the name implies a "refined github". Refer for more details
https://github.com/refined-github/refined-github
Where the link redirects to:
https://wheregoes.com/ <- input your (tinyurl type) link here.
Red Hat Advanced Cluster Security Workshop
https://redhat-scholars.github.io/acs-workshop/acs-workshop/index.html
Container workshop
https://redhat-scholars.github.io/build-a-container/intro-container-workshop/1.0/index.html
Container tutorial
https://github.com/redhat-scholars/containers-tutorial
Containers master course:
https://docs.google.com/presentation/d/1EXBFMoJ-efwO_RiLrNQe34k0QzZ-rnfubsW_TvtBZqc/edit#slide=id.g43aac56bfe_1_0
Operator SDK tutorial
https://redhat-scholars.github.io/operators-sdk-tutorial/template-tutorial/index.html
You'll find few cloudnative workshops here:
https://redhat-scholars.github.io/cloudnative-tutorials/index.html
How to check whether host has KVM support?
virt-host-validate qemu
Live performance:
https://www.youtube.com/watch?v=K1mqNmVPxVI
Lyrics:
கண்ணெதிரே எந்தன் உயிரை காண்பேனோ
உன் புன்னகையில் புனிதம் ஆகி போவேனோ
செம்மலர்கள் யாவும் உன் பாதம் பூக்குமே
அந்த வானம் உனதன்பாகுமே
தகுமோ என் ஜீவனே
தகுமோ என் ஜீவனே
--
கண்ணெதிரே எந்தன் உயிரை காண்பேனோ
உன் புன்னகையில் புனிதம் ஆகி போவேனோ
--
பால்வீதியில் ஆயிரம்
பொழிந்திடும் நிலவுகள்
தாழ் பணிந்துந்தன்
பால் முகம் பார்த்திட ஏங்குமே
பூமி சாமி
மோட்சமே ஆயினும்
நீயே என் தாயே
--
கண்ணெதிரே எந்தன் உயிரை காண்பேனோ
உன் புன்னகையில் புனிதம் ஆகி போவேனோ
செம்மலர்கள் யாவும் உன் பாதம் பூக்குமே
அந்த வானம் உனதன்பாகுமே
தகுமோ என் ஜீவனே
தகுமோ என் ஜீவனே
--
https://www.youtube.com/watch?v=AvmZfX6ahos
Notes taken from above link:
==
5 steps
1. Don't tell I cannot give up sugar.
it is addictive -
No shame
Put sugar in the past.
Life is excellent without sugar.
2. Have short term goals
( I'll never eat sugar - not good - putting too much pressure on giving up )
Set a goal - just today
Everyday say just today.
3. Stabilize blood sugar
cookies, cakes and candies - avoid.
Add blood sugar - non starchy veg.
- healthy fats
- protein
Helps prevent crashes - stabilize Blood Sugar - Helps to stop craving
Refer [1] : 0,1,2,3 checklist
4. Avoid extreme hunger. avoid spiking craving.
(fastening, gym, etc - all in one - quite difficult to do - It is like setting up for failure)
Take time to stabilize blood sugar.
5. Use stoppers.
an item drink, activity - allow you to separate from eating.
Brush your teeth - mint tea after meal.
It changes the taste in mouth - less desirable to eat sweet.
stopper brings acceptance.
stopper: is a pattern disruptor. move into acceptance
meal is over.
pie - short lived.
living fit & healthy - life long freedom.
Choose the best one :)
==
[1] https://drbeckyfitness.com/dr-beckys-0123-strategy/
0 Sugar. Avoid added sugar, sugary treats and foods that contain sugar as
one of the top three ingredients.
1 Large Salad. Include up to 4 cups of any salad greens and an
assortment of non-starchy vegetables (e.g. artichokes, broccoli, cauliflower, celery,
cucumbers, lettuce, mushrooms, onions, peppers, spinach, tomatoes, watercress)
2 cups cooked Non-Starchy Vegetables. Any vegetables
mentioned above as well as asparagus, bok choy, cabbage, collard greens,
eggplant, endive, garlic, green beans, kelp, okra, seaweed, snow peas, spaghetti
or summer squash, swiss chard, zucchini
3 Hours Before Bed, Stop Eating. Determine your normal
bedtime and count back three hours.
==
HAproxy short intro with example:
https://www.haproxy.com/blog/haproxy-configuration-basics-load-balance-your-servers/
Load balancer in RHEL
Advanced one:
https://www.digitalocean.com/community/tutorials/how-to-use-haproxy-to-set-up-http-load-balancing-on-an-ubuntu-vps
Editing networks using virsh
virsh net-edit somenetworkvirsh net-destroy somenetworkvirsh net-start somenetwork
Unless you destroy and start it again it won't be effect.
To verify the changes:
virsh net-dumpxml somenetwork
Creating storage pool using virsh:
virsh pool-create-as default dir --target /var/lib/libvirt/images
virsh pool-dumpxml default > storage-pool.xml
virsh pool-define storage-pool.xml
virsh pool-autostart default
Default username for fedora instance in AWS: fedora
For ubuntu OS, it is ubuntu.
For all others, ec2-user
Please refer AWS documentation for more authentic detail :)
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/managing-users.html
Copy/backup excluding specific file types:
rsync -av -e ssh --exclude='*.qcow2' <directory to copy> root@centos7:/home/username/
To delete a VM and its corresponding storage: (Use with caution you are deleting all the associated storage)
# virsh undefine --domain {VM_NAME_HERE} --remove-all-storage
To delete the snapshots too:
# virsh undefine --domain {VM_NAME_HERE} --delete-snapshots --remove-all-storage
Another safer approach is
# virsh list --all# virsh dumpxml {VM_NAME_HERE} // get the corresponding image.
# virsh undefine --domain {VM_NAME_HERE}
# rm -rf /path/to/image
I faced a error like this:
error: Refusing to undefine while domain managed save image exists
First run this command:
sudo virsh managedsave-remove --domain <domain name>
Next:
# virsh undefine --domain {VM_NAME_HERE} --remove-all-storage
If you face error saying "cannot define domain with nvram" use --nvram with above command.
# virsh undefine --nvram --domain {VM_NAME_HERE} --remove-all-storage
source: https://www.cyberciti.biz/faq/howto-linux-delete-a-running-vm-guest-on-kvm/
List all resources in a namespace:
oc api-resources --verbs=list --namespaced -o name | xargs -t -n 1 oc get --show-kind --ignore-not-found -n <YOUR_NAMESPACE_NAME_HERE>
A mind that is full of conclusions is a dead mind, it is not a living mind. A living mind is a free mind, learning, never concluding.
Krishnamurti in Ojai, California 1973, Talk 3
ImageContentSourcePolicy (ICSP)
ICSP is used to redirect request to a registry to its mirror.
apiVersion: operator.openshift.io/v1alpha1
kind: ImageContentSourcePolicy
metadata:
name: ubi8repo
spec:
repositoryDigestMirrors:
- mirrors:
- example.io/example/ubi-minimal
source: registry.access.redhat.com/ubi8/ubi-minimal
- mirrors:
- example.com/example/ubi-minimal
source: registry.access.redhat.com/ubi8/ubi-minimal
- mirrors:
- mirror.example.com/redhat
source: registry.redhat.io/openshift4
Just for reference:
https://docs.openshift.com/container-platform/4.9/rest_api/operator_apis/imagecontentsourcepolicy-operator-openshift-io-v1alpha1.html
Jump server:
A jump server (a.k.a jump host/ jump box) is
a system on a network used to access and manage devices in a separate security zone.
--
A jump server is a hardened and monitored device
that spans two dissimilar security zones
and provides a controlled means of access between them.
$ oc get nodes
<node details >
$oc debug node/ip-<info >
Starting pod/ip-...
To use host binaries, run `chroot /host`
Pod IP: 10.0.129.43
If you don't see a command prompt, try pressing enter.
sh-4.4#
sh-4.4#
sh-4.4# chroot /host
sh-4.4# cat /etc/containers/registries.conf
unqualified-search-registries = [ 'docker.io']
sh-4.4#
sh-4.4#
sh-4.4# exit
exit
sh-4.4# exit
Removing debug pod ...
https://www.youtube.com/watch?v=8dgoeYPoE-0
Pancreas:
- beneath the ribs
- acts like a personal health coach.
Control sugar level.
produces a special pancreatic juice that release nutrients from the food.
--
Just behind stomach.
- breakdown the food eat.
- aids digesting by producing special tonic made of water.
sodium bicarbonate and digestive enzymes.
sodium bicarbonate neutralizes stomach's natural acidity.
so that , digestive enzyme can perform their jobs.
--
lipase(enzyme) breaks down fatty substance
proteas(enzyme) splits protein
amylase(enzyme) divides carbs to energy rich sugar
Most of those nutrients absorbed into the blood stream. enrich the body.
--
Pancreas another critical task:
controls amount of sugar in blood
uses hormones called:
1. insulin
2. and glucagon
which are produced in special cells call the "Islets of Langerhans".
--
too much / too little of sugar - life threatening
blood - flushed with sugar after big meals
to bring us normal , pancreas release insulin.
excess sugar to cells - as energy source or stored for later.
insulin also tell liver to shutdown sugar production.
blood sugar is low - pancreas release glucagon
- tells body to release stored sugar to blood stream.
This interplay between insulin and glucagon keeps sugar balanced.
--
faulty pancreas - cannot coach.
healthy balance destroyed.
If weakened by disease, production of insulin in reduced/ extinguished
- condition named "diabetes"
Without regular insulin release - sugar builds up in blood.
so hardening blood vessels and causing heart attacks, kidney failure, stroke.
same lack of insulin deprive cell of energy rich sugar need to grow and function.
diabetes - high liver of glucagon - even more sugar circulate.
--
Without pancreas, sugar can go haywire.
pancreas plays major role and need our support :)
--
https://www.youtube.com/watch?v=wbh3SjzydnQ
Liver - 1.4 kg
- 24 hours a day.
- storehouse as well as manufacturing hub as well as processing plant.
--
Filters body blood - regular shipment from two sources
- "hepatic artery" delivers blood from the heart.
- "hepatic portal vein" brings it from the intestine.
- this double delivery fills the liver with nutrients
- sorts, processes and stores with the help of tiny processing unit (lobules).
--
Both blood flows also deliver the oxygen that the liver needs to function.
--
Blood received from intestine contains carbs, fats, vitamins, other nutrients dissolved in it from the food consumed.
need processing in different ways.
For example, carbs - convert to sugar - for energy
leftover nutrient don't immediately required - liver keep it in the storage facility. - (like a pantry).
--
Blood also contains toxins. by-products as well.
convert into product - whisk away them - channel through kidney/ intestine to excrete.
--
make blood plasma protein - transport fatty acids and help from blood cots.
make cholesterol that helps the body create harmones.
Vitamin D
substance that help digesting.
--
Most important product - BILE
Livers cells called hepatocyctes -
convert toxic into greenish liquid.
Bile funneled to small container below liver called gallbladder - trickle to intestine to help breakdown fats, destroy microbes, neutralize extra stomach acid.
Bile also helps to move toxin out of the body.
--
Avoid overburdening of Liver. One way is to have moderate diet.
--
The Liver is also one of the few organs that can regenerate if damaged or severed.
Even if you cut out most of it, and only had 1/3rd left, it can still fully recover.
--
$ git remote set-url origin https://<YOUR TOKEN HERE>@github.com/<YOUR USERNAME HERE>/<YOUR REPO NAME HERE>.git
$ git push --set-upstream origin <YOUR NEW BRANCH IF ANY HERE>