Skip to main content

Initial Settings : Services

 [1]. It's possible to display services' status like follows.

# the list of services that are active now

[root@dlp ~]# systemctl -t service

UNIT                            LOAD   ACTIVE SUB     DESCRIPTION

atd.service                     loaded active running Job spooling tools

auditd.service                  loaded active running Security Auditing Service

chronyd.service                 loaded active running NTP client/server

crond.service                   loaded active running Command Scheduler

dbus.service                    loaded active running D-Bus System Message Bus

.....

.....

user-runtime-dir@0.service      loaded active exited  /run/user/0 mount wrapper

user@0.service                  loaded active running User Manager for UID 0

vdo.service                     loaded active exited  VDO volume services


LOAD   = Reflects whether the unit definition was properly loaded.

ACTIVE = The high-level unit activation state, i.e. generalization of SUB.

SUB    = The low-level unit activation state, values depend on unit type.


45 loaded units listed. Pass --all to see loaded but inactive units, too.

To show all installed unit files use 'systemctl list-unit-files'.


# list of all services

[root@dlp ~]# systemctl list-unit-files -t service

UNIT FILE                                   STATE

arp-ethers.service                          disabled

atd.service                                 enabled

auditd.service                              enabled

autovt@.service                             enabled

blk-availability.service                    disabled

.....

.....

user-runtime-dir@.service                   static

user@.service                               static

vdo.service                                 enabled


181 unit files listed.

[2]. Stop and turn OFF auto-start setting for a service if you don'd need it. (it's smartd as an example below)

[root@dlp ~]# systemctl stop smartd

[root@dlp ~]# systemctl disable smartd

Comments

Post a Comment

Popular posts from this blog

PERL Some good framework

1. Catalyst is the most popular agile Perl MVC web framework that encourages rapid development and clean design without getting in your way. Catalyst | Perl MVC web application framework 2. Mojolicious is a next generation web framework for the Perl programming language. Back in the early days of the web, many people learned Perl because of a wonderful Perl   ... Mojolicious - Perl real-time web framework 3. Documents for Perl  The Perl Archive Network, the gateway to all things Perl. The canonical location for Perl code and modules. The Comprehensive Perl Archive Network - www. cpan .org
Post a Comment
Read more

C++ How to use Date and Time

The C++ standard library does not provide a proper date type. C++ inherits the structs and functions for date and time manipulation from C. To access date and time related functions and structures, you would need to include <ctime> header file in your C++ program. There are four time-related types: clock_t, time_t, size_t , and tm . The types clock_t, size_t and time_t are capable of representing the system time and date as some sort of integer. The structure type tm holds the date and time in the form of a C structure having the following elements: struct tm { int tm_sec ; // seconds of minutes from 0 to 61 int tm_min ; // minutes of hour from 0 to 59 int tm_hour ; // hours of day from 0 to 24 int tm_mday ; // day of month from 1 to 31 int tm_mon ; // month of year from 0 to 11 int tm_year ; // year since 1900 int tm_wday ; // days since sunday int tm_yday ; // days since January 1st int tm_isdst ; // hours of daylight savin...
Post a Comment
Read more

Lambda Function with Amazon DynamoDB

DynamoDB can trigger AWS Lambda when the data in added to the tables, updated or deleted. In this chapter, we will work on a simple example that will add items to the DynamoDB table and AWS Lambda which will read the data and send mail with the data added. Requisites To use Amazon DB and AWS Lambda, we need to follow the steps as shown below − Create a table in DynamoDB with primary key Create a role which will have permission to work with DynamoDBand AWS Lambda. Create function in AWS Lambda AWS Lambda Trigger to send mail Add data in DynamoDB Let us discuss each of this step in detail. Example We are going to work out on following example which shows the basic interaction between DynamoDB and AWS Lambda. This example will help you to understand the following operations − Creating a table called customer in Dynamodb table and how to enter data in that table. Triggering AWS Lambda function once the data is entered and sending mail using Amazon SES service. The basic block diagram that ...
Post a Comment
Read more