ic_agile_128ic_agile_white_128ic_banknote_smile_128ic_business_128ic_business_128ic_checkmark_128ic_client_team_manager_128ic_code_file_128ic_code_files_128ic_corporate_cloud_platforms_128ic_crossplatform_apps_128ic_dedicated_team_128ic_developer_128ic_development_team_128ic_enterprise_128ic_faster_timeframe_128ic_fixed_price_128ic_graph_down_128ic_graph_down_128ic_hourly_128ic_hourly_white_128ic_information_finder_128ic_junior_developer_128ic_managed_team_128ic_message_128ic_mobile_app_startups_128ic_mobile_development_128ic_mobile_development_up_128ic_mobile_devices_128ic_multiplatform_128ic_multiplatform_white_128ic_pricetag_128ic_project_checklist_128ic_project_management_128ic_project_management_team_128ic_research_and_development_team_128ic_scalable_team_128ic_senior_developer_128ic_smaller_codebase_128ic_smaller_price_128ic_startup_128ic_team_manager_128ic_three_times_faster_128K&C_Icons_32pxK&C_Icons_32pxK&C_Icons_32pxK&C_Icons_32pxK&C_Icons_32pxK&C_Icons_32pxK&C_Icons_32pxK&C_Icons_32pxK&C_Icons_32pxK&C_Icons_32pxK&C_Icons_32pxK&C_Icons_32pxK&C_Icons_32pxK&C_Icons_32pxK&C_Icons_32pxK&C_Icons_32pxK&C_Icons_32pxK&C_Icons_32pxK&C_Icons_32pxK&C_Icons_32pxK&C_Icons_32pxK&C_Icons_32pxK&C_Icons_32pxK&C_Icons_32pxK&C_Icons_32pxK&C_Icons_32pxK&C_Icons_32pxK&C_Icons_32pxK&C_Icons_32pxK&C_Icons_32pxK&C_Icons_32pxK&C_Icons_32pxK&C_Icons_32pxK&C_Icons_32pxK&C_Icons_32pxK&C_Icons_32pxK&C_Icons_32pxArrow_Dropdownic_001_google+_16ic_002_xing_16Group 2ic_003_facebook_16ic_004_linkedIn_16Groupic_005_message_16ic_006_upload_16ic_007_remove_16ic_008_email_16ic_009_attachment_16ic_010_file_16ic_011_name_16ic_012_arrow_left_16ic_013_arrow_right_16ic_014_arrow_down_16ic_015_arrow_up_16ic_016_dropdown_arrow_down_16ic_016_dropdown_arrow_leftic_016_dropdown_arrow_rightic_017_K&C_dropdown_arrow_up_16ic_018_language_16ic_019_Quote_16ic_020_+_16ic_021_=_16ic_022_phone_16ic_023_twitter_16ic_024_position_16ic_025_company_16ic_026_search_16ic_027_mobile_16ic_028_fax_16ic_029_location_16ic_030_enlarge_16ic_031_downscale_16ic_032_contactic_download_normal_16pxic_033_skype_16ic_006_download_16 copyic_Interest_based_64ic_acrivate_card_64ic_api_client_64ic_application_architecture_64ic_application_architecture_ white_64ic_application_development_user_64ic_arrow_down_64ic_automated_backups_64ic_automated_infrastructure_provisioning_64ic_automated_infrastructure_provisioning_white_64ic_automated_storage_64ic_automated_storage_64ic_automation_64ic_avaliability_across_the_world_64ic_avaliability_across_the_world_white_64ic_brackets_64ic_brackets_64ic_build_64ic_build_64ic_business_64ic_business_partnership_64ic_business_partnership_white_64ic_business_64ic_calculator_64ic_calendar_64ic_car_rent_64ic_card_renewal_64ic_chat_64ic_chat_bubbles_64ic_chat_bubbles_64ic_chat_white_64ic_checklist_64ic_checkmark_64ic_checkmark_white_64ic_clock_64ic_clock_white_64ic_cloud_media_64ic_cluster_64ic_cluster_white_64ic_code_base_optimization_64ic_coding_64ic_coding_white_64ic_commenting_widget_64ic_commenting_widget_64ic_containers_64ic_containers_white_64ic_continious_64ic_continious_delivery_64ic_continious_delivery_white_64ic_continious_release_64ic_continious_release_white_64ic_continious_white_64ic_cost_saving_64ic_cost_saving_white_64ic_cpu_load_64ic_credit_card_64ic_crossplatform_app_development_64ic_crossplatform_app_development_white_64ic_custom_crm_64ic_custom_crm_64ic_independence_consulring_64ic_database_calls_64ic_database_calls_white_64ic_dedicated_teams_64ic_dedicated_teams_64ic_desktop_application_user_64ic_desktop_application_user_64ic_desktop_code_64ic_desktop_code_white_64ic_developer_64ic_developer_white_64ic_development_64ic_devops_64ic_documents_64ic_documents_graph_64ic_documents_graph_white_64ic_documents_white_64ic_download_presentation_64ic_education_64ic_email_open_64ic_email_open_white_64ic_environment_healthcheckic_euro_64ic_euro_white_64ic_failure_solved_64ic_globe_outlines_64ic_good_quality_64ic_high_load_websites_64ic_high_load_websites_white_64ic_hotel_booking_64ic_inability_64ic_inability_white_64ic_increase_64ic_increase_white_64ic_increasing_team_64ic_independence_64ic_integration_64ic_it_outsourcing_64ic_it_outsourcing_64ic_knowledge_sharing_64ic_mobile_devices_64ic_laptop_user_64ic_laptop_user_64ic_launch_64ic_launch_white_64ic_learning_64ic_learning_two_white_64ic_lighthouse_64ic_link_64ic_load_balancer_64ic_load_balancer_64ic_load_card_64ic_lock_64ic_lock_white_64ic_low_cost_64ic_low_load_websites_64ic_maintenance_tools_64ic_maintenance_tools_white_64ic_media_player_64ic_messaging_platforms_64ic_microservice_architecture_64ic_microservices_64ic_microservices_64ic_mobile_app_64ic_mobile_content_64ic_mobile_development_64ic_mobile_development_white_64ic_mobile_devices_64ic_mobile_devices_white_64ic_mobile_payments_64ic_mobile_social_media_applications_64ic_mobile_workflows_64ic_money_transfers_64ic_multimedia_sharing_64ic_multimedia_sharing_white_64ic_my_garage_64ic_no_access_64ic_no_access_white_64ic_no_oldschool_64ic_online_marketplaces_64ic_online_marketplaces_white_64ic_online_trading_64ic_online_trading_64ic_pair_device_64ic_parallels_64ic_parallels_white_64ic_passcode_64ic_performance_64ic_performance_issues_64ic_performance_issues_white_64ic_performance_white_64ic_plane_64ic_plane_white_64ic_plus_64ic_plus_64ic_pricetags_64ic_product_64ic_product_search_64ic_product_white_64ic_productivity_tools_64ic_productivity_tools_64ic_project_delivery_64ic_project_delivery_white_64ic_project_management_64ic_project_management_collaboration_64ic_project_management_team_64ic_project_management_team_white_64ic_project_risks_reduced_64ic_quality_mark_64ic_quality_mark_white_64ic_question_64ic_react_native_64ic_response_time_64ic_response_time_white_64ic_rest_api_64ic_retail_64ic_transparency_consulting_64ic_scale_up_64ic_scale_up_white_64ic_self_healing_64ic_self_healing_64 copyic_send_money_64ic_server_64ic_server_white_64ic_shopping_64ic_sleep_mode_64ic_small_is_beautiful_64ic_smaller_price_64ic_social_benefits_64ic_social_connections_64ic_socket_64ic_spare_parts_for_cars_64ic_spare_parts_for_cars_white_64ic_speedometer_64ic_performance_consulting_64ic_speedometer_white_64ic_startup_64ic_target_64ic_team_64ic_testing_64ic_testing_checklist_64ic_testing_checklist_64ic_testing_white_64ic_three_times_faster_64ic_touch_64ic_touch_id_64ic_touch_white_64ic_transparency_64ic_ui_design_desktop_64ic_ui_design_mobile_64ic_ui_design_mobile_white_64ic_umbrella_64ic_umbrella_white_64ic_up_and_down_scaling_64ic_up_and_down_scaling_64ic_users_64ic_users_white_64ic_ux_design_64ic_ux_design_desktop_64ic_ux_design_white_64ic_vehicle_64ic_web_based_search_64ic_web_based_search_white_64ic_web_browser_code_64ic_web_browser_developer_mode_64ic_web_browser_user_64ic_web_development_64ic_web_development_white_64ic_web_portals_64ic_web_portals_64ic_web_user_64ic_web_user_white64ic_workflow_64ic_workflow_steps_64ic_workflow_steps_white_64ic_workflow_white_64ic_working_environment_64

How to start services on Linux

white envelope icon
contact us nowwhite envelope icon
Up to 3000 characters
Oops! Something went wrong, please try again later

Scripts of the services to be run in Linux are located in /etc/rc.d/init.d. To make a script start automatically at system launch, a symbolic link to the script should be created and placed in the catalog /etc/rc.d/rcN.d, where N shows the level OR  designation of script execution. 

Linux Initialization Levels - Designation

0 - system halt — the system will be stopped, 

1 - single-user mode — the system initializes minimum services and offers command line to a single user (normally, the superuser) without authentication. This mode is normally used to restore the system, 

2 - multiple-user mode — users can work on different terminals, system log-in with authentication,

3 - multiple-user network mode — unlike the level above, network is set up and various networking services are enabled,

4 - has no standard interpretation and is not generally useful;

5 - graphical subsystem start — similar to level 3, X11 graphical subsystem is also started, and system log-in is performed in graphic mode;

6 - system reboot — when this mode is on, all running applications are stopped and the system reboots

When booting, the system most often uses boot level 3 or 5. However, there is a trick in the name of the symbolic link itself, which many keep silent about, and about which I would like to tell.

Init.d

For example, /etc/rc.d/rc0.d/K60crond and /etc/rc.d/rc3.d/S40crond

indicate the same script /etc/init.d/crond of the system log service. The script starting with "K" corresponds to service shutdown, and with "S" to service start. Numbers preceding the service name provide for scripts start order in the directory. For example, script /etc/rc.d/rc3.d/S34syslogd will be started prior to script /etc/rc.d/rc3.d/S40crond, while /etc/rc.d/rc3.d/K60crond will be started prior to /etc/rc.d/rc3.d/K66syslogd. You may notice that the sum of the numbers for a service equals to 100 — this allows for organizing all scripts in the start order being reverse to that of fulfillment. Creation of symbolic links on your own is rather tiresome, so it is better to use a special utility chkconfig.


The syntax of its use is very easy:

chkconfig --list [service name]
chkconfig --add <service name>
chkconfig --del <service name>
chkconfig [--level <levels>] <service name> <on|off|reset|resetpriorities>

Where service name is the name of the running script located in /etc/rc.d/init.d

However, there is a trick here as well; the issue is that the start script should have a special format, for instance this:

#!/bin/bash
# liferayd Init script for running Liferay Java portal
# chkconfig: - 92 02
# description: Liferay Portal is the leading open source portal for the enterprise, \
# offering content management, collaboration, and social out-of-the-box.
 
if [ -f /etc/init.d/functions ] ; then
. /etc/init.d/functions
elif [ -f /etc/rc.d/init.d/functions ] ; then
. /etc/rc.d/init.d/functions
else
exit 0
fi
 
PATH=/usr/bin:/sbin:/bin:/usr/sbin
export PATH
LRHOMEDIR="/opt/local/portal/"
 
start(){
printf "Starting Portal\r"
su - user -c "cd ${LRHOMEDIR}; ant start-portal"
if [ $? -eq 0 ] ; then
logger -t liferayd Portal build successfully
else
logger -t liferayd Portal build unsuccessfully
fi
}
stop(){
printf "Stoping Portal\r"
su - liferay -c "cd ${LRHOMEDIR}; ant stop-portal-force"
if [ $? -eq 0 ] ; then
logger -t liferayd Portal closed successfully
else
logger -t liferayd Portal closed unsuccessfully
fi
}
restart(){
printf "Restarting Portal\r"
stop
start
}
 
case "$1" in
start )
start
;;
stop)
stop
;;
restart)
restart
;;
*) printf "Usage $0 {start|stop|restart}\n"
;;
esac

The script should have at least 3 potential run keys:


1. start

2. stop

3. restart


these are the basic commands that are used to start, stop and restart.

Figures are put at the very beginning of a file; they indicate the start succession:

# chkconfig: — 92 02

where 92 is a number in the start succession, and 02 is a number in the stop succession.


To add a script to the autostart list, you have to:


1. Create an executable script following the above template

2. Place the executable script in /etc/init.d

3. Run command chkconfig —add executable_script

4. Run command chkconfig executable_script on


That’s it, our portal will now start automatically with the system launch

Systemd

The configuration consists of the files named units. All units are located at:


/usr/lib/systemd/system/ – units from installed RPM packages

/run/systemd/system/ — units created in runtime

/run/systemd/system/ — units created by system administrator


 A unit is a text file:

[Name]
variable_name = value

To create a unit, you have to describe three sections: [Unit], [Service], [Install]


In the Unit section, describe:


Unit description:

Description=Liferay

Then there is a block of variables, which have an effect on the service start order:

After=mysql.service

Running mysql is required to start the service:

Requires=mysql.service

Running nginx is desirable to start the service:

Wants=nginx.service

If the service is in Requires but not in After, our service will be started in parallel to the required service


In the Service section, indicate how the service should be started:


Service type:

Type=simple

systemd suggests that the service will be started right away. The process should not be branched.


Type=forking

systemd suggests that the service is started once and the process branches with completion of the parent process.


Also, you have to determine PIDFile= so that systemd can track the main process:

PIDFile=/var/run/liferay.pid

Operation catalog, it becomes current before starting startup commands:

WorkingDirectory=/opt/local/liferay

User and group:

User=liferay
Group=liferay

Environment variables:

Environment=SERVER=production

Ban for killing the service because of lack of memory and activation of OOM mechanism:

-1000 total ban, -100 reduced probability.

OOMScoreAdjust=-100

Service start/stop and restart commands


ExecStart=/sbin/ant start-portal
ExecStop=/sbin/ant stop-portal-force
ExecReload=/sbin/ant stop-portal-force start-portal

We have a nuance here — systemd insists that the command provide the particular executable file. Full path should be given.


Timeout in seconds, indicating how long to wait for the system to fulfill start/stop commands.

TimeoutSec=300

Ask systemd to automatically restart our service if it suddenly crashes.

Control is exercised on the presence of the process from the PID file

Restart=always

In the [Install] section, describe at what run level the service should be started

Run level:

WantedBy=multi-user.target

multi-user.target or runlevel3.target corresponds to our usual runlevel=3

Unit for systemd is ready:

liferay.service

[Unit]
Description=Liferay
After=mysql.service
Requires=mysql.service
Wants=nginx.service
 
[Service]
Type=forking
PIDFile=/var/run/liferay.pid
WorkingDirectory=/opt/local/liferay
 
User=liferay
Group=liferay
 
Environment=SERVER=production
 
OOMScoreAdjust=-100
 
ExecStart=/sbin/ant start-portal
ExecStop=/sbin/ant stop-portal-force
ExecReload=/sbin/ant stop-portal-force start-portal
TimeoutSec=300
 
[Install]
WantedBy=multi-user.target

Put this file in catalog /etc/systemd/system/:

systemctl status liferay
 
myunit.service - liferay
   Loaded: loaded (/etc/systemd/system/liferay.service; disabled)
   Active: inactive (dead)
systemctl enable liferay
systemctl -l status liferay

If everything is OK, the output will be as follows:

myunit.service - liferay
   Loaded: loaded (/etc/systemd/system/liferay.service; enabled)
   Active: inactive (dead)

Start service:

systemctl start liferay

See status:

systemctl -l status liferay

Restart systemd daemon:

systemctl daemon-reload
SHARE WITH FRIENDS
You might find this interesting
Our cases
Bosch Classic Cars - Digital Engagement Platform for 19K Vintage Car Owners
Our cases
Liferay Portal Performance Tuning Services for a Major Online Gaming Software Supplier
Web
Three Authentication Approaches to Keep Your Clients Safe
Our cases
How to apply React Native while developing heavy cross-platform mobile apps
Mobile
Reasons to believe in Ionic hybrid app
E-book
How to Secure Web Product Development — FREE eBook
E-book
Digital Transformation: the Philosopher’s Stone of Economic Growth
Web,Other
GoLang: Features, Pros and Cons
Our cases
Reference: Major producer of auto electronics and spare parts
Web,Outsourcing,Other
JS Frameworks: The Trendiest Frameworks You Should Know
Our cases
Micro-service Architecture for New AngularJS Application - Case Study
Mobile
Native or Hybrid Apps: A Quick Comparison
Web
A Guidance for Keeping Your Web Development Project Within the Budget: Three Key Pillars
Web
Plan to Succeed: 4 Tips for Building Scalable Software
Web
Microservices… when do we need them?
Web
Debunking imaginary shortcomings of cross-platform frameworks
Our cases
Portal Performance Tuning For Major German Travel Agency
Web,Other
How to Make Your Web Solution Rock: 7 Areas to Check
Web,Outsourcing,Other
Angular 5.0.0 – A Better Version of Itself
E-book
Top Tools for Cost-Effective Web Development — eBook
Web
Cloud Deployment: Overview of Options
Outsourcing,Other
How to Ramp up Your Team Wisely
DevOps
How We Manage Our Infrastructure with Chef
Our cases
Reformation of Deployment Cycle for Bosch Classic Cars Portal
Our cases
Fast and Lightweight Mobile Application based on PhoneGap/ Cordova
Our cases
Drivelog.de — Web Marketplace for Car Owners and Service Providers
Other
Big Data: Why Your Business Needs it ASAP
Web,Outsourcing,Other
How a Company Can Benefit from White Label: K&C experience
E-book
Determining Approaches to Mobile App Development
Web,Other
Dedicated Teams for Web Development: Choice Criteria to be Checked
DevOps,Outsourcing,Other
How to setup Kubernetes cluster on AWS
Web,Our cases
White Label: A Customized Software Solution from a Business and Tech Perspective
DevOps
Setting Up: Traefik Balancer In Rancher Cloud
Outsourcing,Other
Hybrid, SaaS+PaaS, IoT: Cloud Trends to Catch in 2018
DevOps,Outsourcing,Other
ROCKET.CHAT as an internal messaging system and helpdesk platform
Web
Advanced Technologies for Marketing Automation
Web,Outsourcing,Other
Angular 5 VS React.js – Who’s Going to Set the Tone in the Upcoming Year?
Web
Angular 4 vs React – what to choose in 2017
Web,Outsourcing,Other
Angular vs. React vs. Vue – Let the Fight Start!
Outsourcing
The BPM in the Microservice Environment
Web
Monolith, Microservices, Serverless... Are We in the Middle of the Way?
Web
JQuery vs. Angular: Ad Astra per Aspera
Web
SEO Tips & Tricks for Single Page Web Applications
Web
4 Time-Saving Ways to Test Your Cross Platform Mobile App
Web
How to Motivate Your Dedicated Team to Work with Legacy Projects
Web
Cost efficient technologies
Web
Angular 2.0 vs Angular 1.4. What fits you best?
Web
Centralized Logging with Logstash, Elasticsearch & Kibana
Web
A secret formula of an agile dream team
Outsourcing,Testing
How the QA Team Tests Your Project
Web
K&C insights: how to make your workflow work for you
Web
When Microservices Help Make Future-Ready Products
DevOps
How to Build a Rancher & Docker Based Cloud
Web
Agile and DevOps are Key Drivers of Digital Transformation
DevOps
Docker: Virtualize Your Development Environment Right
Web
Technologies that Foster Digital Transformation
DevOps
How We Use Ansіble for Configuration of Our Environments
Web
Scaling software solutions - how it works
DevOps
DevOps with Puppet: Tips on Setting it up for Configuring Servers
DevOps
Use case: how to build and run Docker containers with NVIDIA GPUs
DevOps
Installation and setting up: Nextcloud as a local network storage on CentOS7
Stay tuned!
We'll gladly share fresh blog updates and our best practices to your email.
We protect your data and will notify you on important updates only.