Wednesday, October 18, 2017

Linux Management Misc


https://docs.oracle.com/cd/E37670_01/E37355/html/ol_creating_yum_repo.html
yum check-update
Checks whether updates exist for packages that are already installed on your system.
yum updatepackage
Updates the specified package, including packages on which it depends. For example:
yum upgrade nfs-utils
yum update
Updates all packages, including packages on which they depend.
http://linuxtoolkit.blogspot.com/2009/11/turn-off-checking-for-signature-during.html

Turn off checking for signature during yum localinstall

yum localinstall is a wonderful utility where I can download and install an rpm package and let yum resolve all the dependencies issues for me. Occasionally, during installation, if I don't want to do a signature check. I can use this commands with a --nogpgcheck flag

# yum localinstall gummi-0.4.2-1.noarch.rpm --nogpgcheck
To enable all repositories run "yum-config-manager --enable \*". -
-disable Disable the specified repos (automatically saves). 
To disable all repositories run yum-config-manager --disable \*
https://www.cyberciti.biz/faq/centos-fedora-redhat-yum-repolist-command-tolist-package-repositories/
Type the following command:
# yum -v repolist
# yum -v repolist | less
# yum repolist


To list only enabled repos, enter:
# yum repolist enabled
To list only disabled repos, enter:
# yum repolist disabled
To list all repos (default), enter:
# yum repolist all


https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Deployment_Guide/sec-Managing_Yum_Repositories.html
yum-config-manager --add-repo repository_url

yum-config-manager --enable repository
https://serverfault.com/questions/437789/how-to-install-java-1-7-0-openjdk-devel-on-rhel-server-6-3
The package you are looking for is in the Red Hat Enterprise Linux Server Optional channel which may not be enabled.
Try this:
# yum repolist all
# yum-config-manager --enable rhel-6-server-optional-rpms
I removed the -devel and it worked:
yum install java-1.7.0-openjdk
If you already have another java version installed, don't forget to configure the system so that the new version will be used:
If you already have another java version installed, don't forget to configure the system so that the new version will be used:
alternatives --config java
https://www.server-world.info/en/note?os=CentOS_7&p=jdk8&f=2

yum -y install java-1.8.0-openjdk java-1.8.0-openjdk-devel
# make sure the PATH

[root@dlp ~]#
dirname $(readlink $(readlink $(which java))) 

/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.102-1.b14.el7_2.x86_64/jre/bin
[root@dlp ~]#
vi /etc/profile
# add forrlow to the end

export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.102-1.b14.el7_2.x86_64
export PATH=$PATH:$JAVA_HOME/bin
export CLASSPATH=.:$JAVA_HOME/jre/lib:$JAVA_HOME/lib:$JAVA_HOME/lib/tools.jar
[root@dlp ~]#
source /etc/profile
[2]If another version of JDK had been installed, change the default like follows.
[root@dlp ~]#
alternatives --config java 

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