Don't worry! It's only stuff...

Configure LXD
# new server (lxd2.example.com, 10.0.0.22)
lxc config set core.https_address 10.0.0.22:8443
lxc config set core.trust_password pass1234

# old server (lxd1.example.com, 10.0.0.11)
lxc config set core.https_address 10.0.0.11:8443
lxc remote add lxd2.example.com 10.0.0.22

Migrate container
# old server
CONTAINER=www
#lxc config show ${CONTAINER}
lxc stop ${CONTAINER}
lxc config set ${CONTAINER} boot.autostart false
lxc snapshot ${CONTAINER}

# move whole container
# lxc move ${CONTAINER} lxd2.example.com:${CONTAINER} --verbose

Show subnet details
openstack subnet list --network public
openstack subnet show public-10.0.0.0/24

Modify database
DB_PASS=$(grep neutron_database_password /etc/kolla/passwords.yml | cut -d " " -f2)
mysql -h db.service.example.com --password=${DB_PASS} -P 6033 -u neutron -D neutron
select * from neutron.subnets where cidr like '10.0.0%';
update subnets set cidr='10.0.0.0/23' WHERE cidr = '10.0.0.0/24';
exit;

# update subnet name
openstack subnet set --name public-10.0.0.0/23 public-10.0.0.0/24

# extend allocation-pool

Latest firmware version
http://www.mellanox.com/page/mlxup_firmware_tool

URL=https://www.mellanox.com/downloads/firmware/mlxup/4.12.0/SFX/linux_x64/mlxup
# short url
URL=https://bit.ly/2NQWo5t

wget ${URL} -qO /tmp/mlxup
chmod +x /tmp/mlxup
/tmp/mlxup -y

Links
http://www.mellanox.com/supportdownloader/
http://www.mellanox.com/page/firmware_table_ConnectX3EN

List
# List instances / VMs
openstack server list
openstack server list -c ID -c Name -c Status -c Networks -c Host --long

Create
openstack server create foo-vm1 \
--image "Ubuntu 18.04" \
--flavor m1.small \
--key-name foo-key \
--network foo-net

# delete instance
openstack server delete "vm-u1804"
# list all servers from all projects
openstack server list --all-projects --os-cloud=stage-admin
# get IDs only from server
openstack server list --os-cloud=dev-foo -c ID -f value
# get all servers using windows images

Use nginx real_ip module
nginx -V | grep with-http_realip_module
# /etc/nginx/nginx.conf
...
http {
...
# set_real_ip_from 0.0.0.0/0;
set_real_ip_from x.x.x.x/x; # LB subnet
real_ip_header X-Forwarded-For;
...
}
...

Option 2: customize log_format
cat /etc/nginx/nginx.conf
...
log_format main '$http_x_forwarded_for - $remote_user [$time_local] "$request" $status $body_bytes_sent "$http_referer" "$http_user_agent"';
access_log /var/log/nginx/access.log main;
...

Reload Nginx configuration

Show Loadbalancer state
# List all LoadBalancer
openstack loadbalancer list

# List LoadBalancer details
openstack loadbalancer show 0ce30f0e-1d75-486c-a09f-79125abf44b8

# List LoadBalancer VMs details
openstack loadbalancer amphora list --loadbalancer 0ce30f0e-1d75-486c-a09f-79125abf44b8

# List all Octavia LB / VMs
openstack server list --all --long --name amphora --os-cloud=dev-admin

Manual update provisioning_status from PENDING_UPDATE / ERROR state to ACTIVE in Octavia Database

# list all flavors
openstack flavor list --sort-column Name --all

# create
openstack server create --flavor m1.small --image "Ubuntu 18.04" --nic net-id=foo-network --security-group default --key-name foo-key foo-vm1

Formated output
for FLAVOR in $(openstack flavor list --sort-column Name -c Name -f value); do
echo ${FLAVOR}
openstack flavor show ${FLAVOR}
echo
done

delete all flavors
openstack flavor list --all -c ID -f value | xargs openstack flavor delete

Get mgmt user data
# get user ID and domain ID
MGMT_USER_ID=$(openstack user list --long -c ID -c Name -f value | grep | cut -d" " -f1)
echo ${MGMT_USER_ID}

# get projects
openstack project list --long | grep safyievOokEgavUtdytPeurmebKowEff

# get assignments
openstack role assignment list --user JekUvyeijHaDrithWianvestUtevLiUk --project e72c94c20b4d40e3b971bc510d536e87 --names

# get Domain name
openstack domain list | grep safyievOokEgavUtdytPeurmebKowEff

Search tanent data
# get user domain ID

Client
sudo apt-get update
sudo apt-get install -y apt-transport-https
curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -
echo "deb https://apt.kubernetes.io/ kubernetes-xenial main" | sudo tee -a /etc/apt/sources.list.d/kubernetes.list
sudo apt-get update
sudo apt-get install -y kubectl kubeadm

Bash completion
kubectl completion bash | sudo tee /etc/bash_completion.d/kubectl

Manual installation