Setting up a robust programming environment requires careful configuration, particularly if you’re looking to install critical components like JDK, MySQL, Redis, Zookeeper, RabbitMQ, and Tomcat on a CentOS system. This guide will walk you through the installation process in a step-by-step manner.

Step 1: Installing the Java Development Kit (JDK)

• Check your existing Java installation:

java –version

• If you have prior installations, remove them to avoid conflicts:

rpm -qa | grep java
rpm -e --nodeps 

• Create a directory to hold the JDK:

mkdir /usr/local/java

• Extract and install the JDK:

tar -xvf jdk-7u71-linux-i586.tar.gz

• Configure the Java environment:

vi /etc/profile
# Add the following lines:
export JAVA_HOME=/usr/local/java/jdk1.7.0_45
export JRE_HOME=$JAVA_HOME/jre
export CLASSPATH=.:$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/dt.jar
export PATH=$JAVA_HOME/bin:$PATH
source /etc/profile

• Verify your installation:

java -version

Step 2: Setting Up MySQL

• Check existing MySQL installations:

rpm -qa | grep mysql

• Remove any stale installations:

rpm -e --nodeps mysql

• Install MySQL server:

yum install -y mysql-server mysql mysql-devel

• Start the MySQL service:

service mysqld start

• Set a root password:

mysqladmin -u root password 'your_password'

Step 3: Installing Redis

• Install dependencies:

yum -y install cpp binutils glibc glibc-kernheaders glibc-common glibc-devel gcc make gcc-c++ libstdc++-devel tcl

• Create a directory for Redis and extract the files:

mkdir -p /usr/local/redis
tar -xvf redis-2.8.17.tar.gz
cd redis-2.8.17
make

• Edit Redis configuration:

vi /etc/redis.conf
# Set the following lines:
daemonize yes
requirepass your_password
bind 127.0.0.1
port 6379

• Start Redis:

redis-server /etc/redis.conf

Step 4: Installing Zookeeper

• Extract Zookeeper:

tar -zxvf zookeeper-3.4.6.tar.gz
mv conf/zoo_sample.cfg conf/zoo.cfg

• Start Zookeeper:

bin/zkServer.sh start

Step 5: Installing RabbitMQ

• Install Erlang:

yum install esl-erlang_17.3-1~centos~6_amd64.rpm

• Install RabbitMQ server:

rpm -ivh rabbitmq-server-3.4.1-1.noarch.rpm

• Start RabbitMQ service:

service rabbitmq-server start

Step 6: Installing Tomcat

• Create the web directory and extract Tomcat:

mkdir /usr/local/web
tar -zxvf apache-tomcat-7.0.61.tar.gz

• Set environment variables for Tomcat:

vi /etc/profile
# Add the following lines:
export CATALINA_BASE=/usr/local/web/apache-tomcat-7.0.61
export TOMCAT_HOME=/usr/local/web/apache-tomcat-7.0.61
source /etc/profile

• Start Tomcat:

bin/startup.sh

Troubleshooting Ideas

If you encounter any issues during installation, here are some troubleshooting tips:

• Ensure all dependencies are installed properly before starting each installation.
• If a service fails to start, check the log files located in the corresponding installation directories for error messages.
• If configuration files are not being recognized, ensure they are in the right location and have the correct permissions.
• For persistent path issues, double-check your profile settings to confirm no typos exist.

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Conclusion

By following these steps, you have successfully set up essential services on your CentOS system. Each service plays a crucial role in creating a seamless development environment. Always ensure you update your installations regularly and monitor their operations for optimal performance.

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