Jesu Gomez jesugmz

GNU/Linux debbuging tools

`ctop`

top-like interface for container metrics.

`dig`

DNS lookup utility.

sed spreadsheet

Delete the first line

Example:

$ df -h
Filesystem           Size  Used Avail Use% Mounted on
udev 3,9G 0 3,9G 0% /dev

Filesystem Hierarchy Standard

This standard consists of a set of requirements and guidelines for file and directory placement under UNIX-like operating systems.

docker login will produce a base64 digest if the binaries pass and secretservice are not present on Linux platforms (source).

To generate a base64 auth token:

echo -n 'username:password' | base64

Tuning the Linux kernel

CPU governor

By default, Container Linux uses the "performance" CPU governor meaning that the CPU operates at the maximum frequency regardless of load. This is reasonable for a system that is under constant load or cannot tolerate increased latency. On the other hand, if the system is idle much of the time and latency is not a concern, power savings may be desired.

Governor	Description
`performance`	Default. Operate at the maximum frequency
`ondemand`	Dynamically scale frequency at 75% cpu load

To install sample Kibana dashboards run this command in the Kibana node:

docker run docker.elastic.co/beats/metricbeat:6.3.0 setup -e -E output.elasticsearch.hosts=['<ELASTICSEARCH_IP>:<ELASTICSEARCH_PORT>'] -E setup.kibana.host=<KIBANA_IP>:<KIBANA_PORT> -E output.logstash.enabled=false --dashboards

Note: the version of metricbeat can be whatever you want to have. Check the list of releases in the Elastic Docker Registry.

More info:

p {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

See for a live example.

	#
	# Ugly but functional example about how shared volumes works in Docker Compose 3 without relying on `volumes_from`
	#
	# See https://docs.docker.com/compose/compose-file/#volume-configuration-reference
	#
	version: "3"
	services:
	web:
	image: php:7-fpm
	volumes:

	export const ANIMAL_TYPES = [
	{
	text: 'Perros',
	value: 1,
	},
	{
	text: 'Gatos',
	value: 2,
	},
	];