mtilson

Option 1 - WORKING

deploy.yaml content

apiVersion: apps/v1
kind: Deployment
metadata:
  name: tpd
spec:

mtilson

How to define and reference different helm values depending on the environment being deployed

Approach 1

• Using environment slug to determine environment variable values from helm values structure for multi-environment configuration

Directory structure

$ tree

mtilson

$ terraform init
Initializing modules...
- eun1 in module
- euw2 in module
- use1 in module

Initializing the backend...

Initializing provider plugins...
- Finding hashicorp/aws versions matching "~> 4.27.0"...

mtilson

How to setup static DNS servers in DHCP environment for Ubuntu 18.04

Enable systemd-networkd debugging

$ sudo mkdir -p /etc/systemd/system/systemd-networkd.service.d/

$ sudo cat > /etc/systemd/system/systemd-networkd.service.d/05-enable-debugging.conf << _EOF
[Service]
Environment=SYSTEMD_LOG_LEVEL=debug

mtilson

highlight DiffAdd    cterm=bold ctermfg=10 ctermbg=17 gui=none guifg=bg guibg=Red
highlight DiffDelete cterm=bold ctermfg=10 ctermbg=17 gui=none guifg=bg guibg=Red
highlight DiffChange cterm=bold ctermfg=10 ctermbg=17 gui=none guifg=bg guibg=Red
highlight DiffText   cterm=bold ctermfg=10 ctermbg=88 gui=none guifg=bg guibg=Red

mtilson

# show containers in 'exited' state created more than 10 days ago (240 hours)
#   change STATE to the requested container state, can be 'exited', 'created' or 'running'
#   change HOURS to the requested time in hours
docker container ls -a --format \
  'HOURS=240; STATE=exited; TIME_CREATED="{{.CreatedAt}}";
  if [[ {{.State}} = $STATE ]]; then
    TIME_CREATED=$(date -d "${TIME_CREATED% *}" +%s);
    TIME_POINT=$(($(date '+%s')-$HOURS*3600));
    if [[ $TIME_CREATED -lt $TIME_POINT ]] ; then
      echo "{{.ID}}|{{.Names}}|{{.RunningFor}}" ;

mtilson

# generate RSA private key
openssl genrsa -out 01-key.pem

# get corresponding public key
openssl pkey -in 01-key.pem -inform pem -out 02-pub.pem -outform pem -pubout

# get JWT header
echo -n '{"alg":"RS256","typ":"JWT"}' > 03-header.json

# make sure the content doesn't have trailing newline

mtilson

aws route53 list-hosted-zones | jq '.HostedZones[].Id' | tr -d '"' | while read zone ; do 
  echo "== $zone"
  aws route53 list-resource-record-sets --hosted-zone-id $zone --query "ResourceRecordSets[?Type == 'A']" | \
    grep '"Name":\|DNSName\|Value' | \
    sed -e 's/ //g' | \
    sed -n -f route53.sed
done

mtilson

cd $(mktemp -d)

# `./config` - existent kubeconfig to merge to (like ~/.kube/config)
# `./configToAdd` - new kubeconfig to merge from

cat <<_EOF_ > ./config
apiVersion: v1
clusters:
- cluster:
    certificate-authority-data: MQo=

mtilson

Common methods for AWS EC2 and GCP GCE

# AWS
$ dig +short myip.opendns.com @resolver1.opendns.com
18.224.203.147

# GCP