How To Install lacme on Ubuntu 20.04
Introduction
In this tutorial we learn how to install lacme
on Ubuntu 20.04.
What is lacme
lacme is:
lacme is divided into four components, each with its own executable:
A process to manage the account key and issue SHA-256 signatures needed for each ACME command. (This process binds to a UNIX-domain socket to reply to signature requests from the ACME client.) One can use the UNIX-domain socket forwarding facility of OpenSSH 6.7 and later to run this process on a different host.
A “master” process, which runs as root and is the only component with access to the private key material of the server keys. It is used to fork the ACME client (and optionally the ACME webserver) after dropping root privileges. For certificate issuances, it also generates Certificate Signing Requests, then verifies the validity of the issued certificate, and optionally reloads or restarts services.
An actual ACME client, which builds ACME commands and dialogues with the remote ACME server. Since ACME commands need to be signed with the account key, the “master” process passes the UNIX-domain socket of the account key manager to the ACME client: data signatures are requested by writing the data to be signed to the socket.
For certificate issuances, an optional webserver, which is spawned by the “master” process when no service is listening on the HTTP port. (The only challenge type currently supported is “http-01”, which requires a webserver to answer challenges.) That webserver only processes GET and HEAD requests under the “/.well-known/acme-challenge/” URI. By default some iptables(8) rules are automatically installed to open the HTTP port, and removed afterwards.
There are three methods to install lacme
on Ubuntu 20.04. We can use apt-get
, apt
and aptitude
. In the following sections we will describe each method. You can choose one of them.
Install lacme Using apt-get
Update apt database with apt-get
using the following command.
sudo apt-get update
After updating apt database, We can install lacme
using apt-get
by running the following command:
sudo apt-get -y install lacme
Install lacme Using apt
Update apt database with apt
using the following command.
sudo apt update
After updating apt database, We can install lacme
using apt
by running the following command:
sudo apt -y install lacme
Install lacme Using aptitude
If you want to follow this method, you might need to install aptitude first since aptitude is usually not installed by default on Ubuntu. Update apt database with aptitude
using the following command.
sudo aptitude update
After updating apt database, We can install lacme
using aptitude
by running the following command:
sudo aptitude -y install lacme
How To Uninstall lacme on Ubuntu 20.04
To uninstall only the lacme
package we can use the following command:
sudo apt-get remove lacme
Uninstall lacme And Its Dependencies
To uninstall lacme
and its dependencies that are no longer needed by Ubuntu 20.04, we can use the command below:
sudo apt-get -y autoremove lacme
Remove lacme Configurations and Data
To remove lacme
configuration and data from Ubuntu 20.04 we can use the following command:
sudo apt-get -y purge lacme
Remove lacme configuration, data, and all of its dependencies
We can use the following command to remove lacme
configurations, data and all of its dependencies, we can use the following command:
sudo apt-get -y autoremove --purge lacme
References
Summary
In this tutorial we learn how to install lacme
package on Ubuntu 20.04 using different package management tools: apt
, apt-get
and aptitude
.