Web thingy

NOTATIONS

HARWARE TODOS

• The olmanode failing server: Need to change EFI/BOOT/grubx64.efi to windows "clone" (https://ubuntuforums.org/showthread.php?t=2243715).
• Current state is to try and change the bootloader floppy drives EFI settings and hope the server EFI clones the floppy EFI.

CLUSTER CONFIG

MONGODB

• Due to mongo v 5.0+ not supporting older CPUs, the mongo used is downgraded to mongo 4.4.6, see issue for further reading (docker-library/mongo#485)

MONGO CREATE NEW USER

use admin

db.createUser(
{
    user: "nils",
    pwd: "pass123",
    roles: [ "root" ]
})

K8S OFFICIAL API REFRENCES

https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.19/#-strong-write-operations-deployment-v1-apps-strong-

TAINTS AND TOLERATIONS / NODE SELECTOR

• worker nodes = none
• gameServer nodes = gameServer=True:NoExecute

command for nodes:

kubectl taint nodes <NODE> gameServer=True:NoExecute

config for pods:

tolerations:
- key: "gameServer"
  value: "True"
  effect: "NoExecute"

nodeSelector:
    nameServer: "True"

ERR

• if network err, check if container connection to 8.8.8.8, if case, probably coreDNS (DNS server, ###NOTE coreDNS uses host /etc/resolvd.conf as upstream config), else, check flannel configuation, try restart.

GENERAL WISDOM

Grub

set root=(hd0,6)
set prefix=(hd0,6)/boot/grub
insmod normal
normal

GITHUB

SAVE USER CREDENTIALS

git config --global credential.helper store

REVERT LAST COMMIT LOCALLY

git reset --soft HEAD~1

COMMIT DELETED FILES

git commit -m "" -a

DOCKER

DOCKER BUIDL NEW IMAGE

1. Create repo at docker hub
2. build ant test image locally:

docker build . -t ilmal/<REPO_NAME>:<TAG_NAME>

docker run -d -p <OUTSIDE_PORT>:<INSIDE_PORT> <IMAGE_ID>

3. push local image to cloud:

docker push ilmal/<REPO_NAME>:<TAG_NAME>

DOCKER PYTHON TEMPLATE

FROM python:3.9
EXPOSE <PORT>
WORKDIR /app
COPY requirements.txt requirements.txt
RUN pip3 install -r requirements.txt
COPY . .
CMD [ "python3", "app.py" ]

K8S

CREATE NEW NAME_SPACE

can't use "_"

kubectl create namespace <namespace name>

K8S DEPLOYMENT BOILERPLATE

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment # can't use "_"
  namespace: <NAME_SPACE> # can't use "_"
  labels:
    app: nginx
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.14.2
        ports:
        - containerPort: 80