Linux commands explained
This command is used to install packages on multiple computers via the Ansible automation tool. The following is a full English description and explanation of the command and parameters:
ansibleis a command-line tool for Ansible.
allIndicates that an action is performed on all hosts defined in the ansible manifest file.
-ais an abbreviation for "ad-hoc", which means an impromptu command.
"yum -y install ftp"is the specific command to be executed, where:
yumis an acronym for "Yellowdog Updater, Modified", which is a package manager in Red Hat and its derivatives.
-yAn abbreviation for "yes" that is used to automatically answer all prompts as "yes".
installis an installation operation.
ftpis the name of the package to be installed.
In summary, the purpose of this command is to automatically install on all hosts defined in the ansible manifest fileftpSoftware package, no need for manual intervention to confirm.
ad-hoc"The word ** is Latin and means "for this purpose". In English, it is often used to describe something that is made on the fly for a specific purpose or need, rather than being planned in advance. For example, an "ad-hoc committee" is usually set up to deal with a single matter of limited scope.
ad-hoc"There is no complete English form because it is a complete word in its own right. It is used to describe actions or decisions that are taken on an ad hoc basis in those specific situations, rather than a widely applied standard procedure or methodology.
Ad-hoc execution"Refers to an operation that is performed on an ad hoc basis based on current needs without prior planning or scheduling. In the context of ansible,"ad-hoc"A command is a command that a user enters temporarily in the command line to quickly perform some simple task without writing a complex script or playbook. This command is typically used for one-time tasks, or when you need to take immediate action on a server farm. For example, check if a package is installed on a group of servers, or quickly install or update a package.
Temporary execution based on current needs"This concept refers to taking immediate action or making decisions based on the needs or problems at the time in a given situation, rather than relying on pre-made plans or procedures. This is often used to respond to unexpected events or to complete some unusual tasks.
As an example, let's say you're a network administrator and you suddenly receive a report that a server within your company is unreachable. You don't have a pre-planned plan for how to handle this situation because it doesn't happen very often. So, you immediately execute one with ansible"ad-hoc"commands, such as:ansible all -m pingto check the connectivity of all servers. This command is executed on an ad hoc basis based on current needs, as you need to quickly identify the problem, rather than executing a task in a long-term plan.
This practice is very useful in situations where a quick response is required, saving time and resolving issues directly.