Environmental variables issues in the CentOS service

Problem Description :

in the previous test, Intel Media Server Studio made a hard-coding and put the application into a service script in the/etc/init.d/directory. However, the test found that the effect of using service and/etc/init.d/started differently. When using service startup, the hard-knitting is not working properly and the printing information obtained is:[H264_qsv @ 0x27fa960] Warning:not compiled with thread support, using thread emulation LIBVA info:va-api version 0.35.0 LIBVA info:va_getdrivername () returns 0 LIBVA info:trying to open/usr/lib64/dri/i965_drv_video.so LIBVA info:va_opendriver () returns-1
When booting through/etc/init.d/, it can be hard-coded, and the printing information obtained is:H264_QSV @ 0x384a960] Warning:not compiled with thread support, using thread emulation LIBVA info:va-api version 0.35.0 LIBVA info:va_getdrivername () returns 0 LIBVA Info:user requested driver ' IHD ' LIBVA info:trying to open/opt/intel/mediasdk/lib64/ihd_drv_video.so LIBVA info:found init function __vadriverinit_0_32 LIBVA info:va_opendriver () returns 0 [H264_qsv @ 0x384a960] ZX Debug:ff_qsv_enc_init OK.
Confirm that the program is started with one, so it is doubtful that the service and direct/etc/init.d/execution scripts are different. Troubleshooting:After the investigation, determine the environment variables.
The following environment variables are required for a hard-coding program:"Libva_drivers_path=/opt/intel/mediasdk/lib64",
"LIBVA_DRIVER_NAME=IHD",
"MFX_HOME=/OPT/INTEL/MEDIASDK"

It has been confirmed that the current environment has these environment variables. (found in/etc/profile.d/directory with intel-mediasdk-devel.sh and intel-mediasdk.sh two scripts set environment variables) To troubleshoot the test content: use env on a normal terminal: [Root@localhostetc]# Env
xdg_session_id=261
Hostname=localhost.localdomain
libva_drivers_path=/opt/intel/mediasdk/lib64
selinux_role_requested=
Term=linux
Shell=/bin/bash
histsize=1000
ssh_client=10.33.3.8 49717
selinux_use_current_range=
LIBVA_DRIVER_NAME=IHD
OLDPWD=/ETC/PROFILE.D
SSH_TTY=/DEV/PTS/6
User=root
ls_colors=rs=0:di=01;34:ln=01;36:mh=00:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=40;31;01:mi=01;05 ; 37;41:su=37;41:sg=30;43:ca=30;41:tw=30;42:ow=34;42:st=37;44:ex=01;32:*.tar=01;31:*.tgz=01;31:*.arc=01;31:*. arj=01;31:*.taz=01;31:*.lha=01;31:*.lz4=01;31:*.lzh=01;31:*.lzma=01;31:*.tlz=01;31:*.txz=01;31:*.tzo=01;31:*. t7z=01;31:*.zip=01;31:*.z=01;31:*. Z=01;31:*.dz=01;31:*.gz=01;31:*.lrz=01;31:*.lz=01;31:*.lzo=01;31:*.xz=01;31:*.bz2=01;31:*.bz=01;31:*.tbz=01;31 :*. tbz2=01;31:*.tz=01;31:*.deb=01;31:*.rpm=01;31:*.jar=01;31:*.war=01;31:*.ear=01;31:*.sar=01;31:*.rar=01;31:* . alz=01;31:*.ace=01;31:*.zoo=01;31:*.cpio=01;31:*.7z=01;31:*.rz=01;31:*.cab=01;31:*.jpg=01;35:*.jpeg=01;35:*. gif=01;35:*.bmp=01;35:*.pbm=01;35:*.pgm=01;35:*.ppm=01;35:*.tga=01;35:*.xbm=01;35:*.xpm=01;35:*.tif=01;35:*. tiff=01;35:*.png=01;35:*.svg=01;35:*.svgz=01;35:*.mng=01;35:*.pcx=01;35:*.mov=01;35:*.mpg=01;35:*.mpeg=01;35:* . m2v=01;35:*.mkv=01;35:*.webm=01;35:*.ogm=01;35:*.mp4=01;35:*.m4v=01;35:*.mp4v=01;35:*.vob=01;35:*.qt=01;35:*.nuv=01;35:*.wmv=01;35:*.asf=01;35:*.rm=01;35:*.rmvb=01;35:*.flc=01;35:*.avi=01;35:*.fli=01; 35:*.flv=01;35:*.gl=01;35:*.dl=01;35:*.xcf=01;35:*.xwd=01;35:*.yuv=01;35:*.cgm=01;35:*.emf=01;35:*.axv=01;35:* . anx=01;35:*.ogv=01;35:*.ogx=01;35:*.aac=01;36:*.au=01;36:*.flac=01;36:*.mid=01;36:*.midi=01;36:*.mka=01;36:*. MP3=01;36:*.MPC=01;36:*.OGG=01;36:*.RA=01;36:*.WAV=01;36:*.AXA=01;36:*.OGA=01;36:*.SPX=01;36:*.XSPF=01;36:
ssh_auth_sock=/tmp/ssh-4wzhtoatll/agent.3745
Mail=/var/spool/mail/root
Path=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin
pwd=/etc
Lang=en_us. UTF-8
MFX_HOME=/OPT/INTEL/MEDIASDK
selinux_level_requested=
histcontrol=ignoredups
shlvl=1
Home=/root
Logname=root
ssh_connection=10.33.3.8 49717 10.33.2.197
lessopen=| | /usr/bin/lesspipe.sh%s
xdg_runtime_dir=/run/user/0
_=/usr/bin/env
[Root@localhostetc]#

write a simple service script,

#!/bin/sh
#export libva_drivers_path=/opt/intel/mediasdk/lib64 #export LIBVA_DRIVER_NAME=IHD #export mfx_home=/opt/intel/mediasdk
start () { echo "Start" Env }
Stop () { echo "Stop" Env }
Restart () { Stop Start }
Case "$" in start) Start         ;; stop) Stop         ;; restart) Restart         ;;     *) echo $ "Usage: $ {start|stop|status|restart}" Exit 2 Esac exit $? Test: [[email protected]init.d]# Service Test Stop
Stop
Term=linux
systemctl_skip_redirect=
Path=/sbin:/usr/sbin:/bin:/usr/bin
pwd=/
Shlvl=1
systemctl_ignore_dependencies=
_=/bin/env visible, there is a lack of many environment variables.
To manually add an environment variable: [[email protected]init.d]# Service Test Stop
Stop
libva_drivers_path=/opt/intel/mediasdk/lib64
Term=linux
LIBVA_DRIVER_NAME=IHD
systemctl_skip_redirect=
Path=/sbin:/usr/sbin:/bin:/usr/bin
pwd=/
MFX_HOME=/OPT/INTEL/MEDIASDK
Shlvl=1
systemctl_ignore_dependencies=
_=/bin/env written at the end:

Check the service manual and you can understand some of the service's details: When the service runs the specified services (known as the System V initial script), most of the environment variables are removed, only the Lang and term environment variables are preserved, and the current path is set to/, This means running the service script in a very clean environment that can be predicted. This script is saved in the/ETC/INIT.D directory, and it supports at least the start and stop commands.

so when using the service, be careful when using environment variables.

Environmental variables issues in the CentOS service