Installing Wordpress in Redhat/Centos

sudo yum update -y
sudo amazon-linux-extras install -y lamp-mariadb10.2-php7.2 php7.2
sudo yum install -y httpd
sudo systemctl start httpd
sudo systemctl enable httpd
wget https://wordpress.org/latest.tar.gz
tar -xzf latest.tar.gz
cp wordpress/wp-config-sample.php wordpress/wp-config.php
nano wordpress/wp-config.php
sudo cp -r wordpress/* /var/www/html/

sudo chown -R apache /var/www
sudo chgrp -R apache /var/www
sudo chmod 2775 /var/www
sudo find /var/www -type d -exec sudo chmod 2775 {} \;
sudo find /var/www -type f -exec sudo chmod 0664 {} \;
sudo systemctl restart httpd

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Best Practices to run Nodejs

The safe user does not have permissions to use default http port 80.
Do not run your applications as a root.

To use http port for non root user,
use the below

sudo apt-get install libcap2-bin

 sudo setcap cap_net_bind_service=+ep `readlink -f \`which node\``

Now you can able access default http port.

 

for nodejs

node app.js

production:

pm2 start app.js

forever start app.js

 

 

instead of sudo node app.js

sudo pm2 app.js

etc.

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sudo -u keycloak ./jboss-cli.sh 'embed-server,/subsystem=undertow/server=default-server/http-listener=default:write-attribute(name=proxy-address-forwarding,value=true)'
Cannot start embedded server: Failed to instantiate class "org.jboss.logmanager.handlers.PeriodicRotatingFileHandler" for handler "FILE": java.lang.reflect.InvocationTargetException: /opt/keycloak-3.4.3.Final/standalone/log/server.log (Permission denied)




solution:

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https required keycloak

Keycloak admin login page not showing without https .

Disable https in the dashboard, but without logging in, we cannot disable.

So use the below commands

go to bin folder of keycloak.

./kcadm.sh config credentials --server http://localhost:8080/auth --realm master --user admin
./kcadm.sh update realms/realmname -s sslRequired=NONE

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https: Address already in use /0.0.0.0:8443

18:02:14,277 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-1) MSC000001: Failed to start service org.wildfly.undertow.listener.https: org.jboss.msc.service.StartException in service org.wildfly.undertow.listener.https: Address already in use /0.0.0.0:8443
    at org.wildfly.extension.undertow//org.wildfly.extension.undertow.ListenerService.start(ListenerService.java:179)
    at org.jboss.msc//org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:2032)
    at org.jboss.msc//org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1955)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
    at java.base/java.lang.Thread.run(Thread.java:844)

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PPK to Pem Conversion in Mac

PPK to PEM conversion in MAC

puttygen privatekey.ppk -O private-openssh -o privatekey.pem

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No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?

[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 47.995 s
[INFO] Finished at: 2018-04-11T12:51:26+00:00
[INFO] Final Memory: 210M/483M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project keycloak-common: Compilation failure
[ERROR] No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?
[ERROR] -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
[ERROR] 
[ERROR] After correcting the problems, you can resume the build with the command
[ERROR]   mvn <goals> -rf :keycloak-common 

Solution:

sudo apt-get install openjdk-8-jdk

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