Tutorial on installing and configuring Tomcat on Alibaba Cloud Server and adding external network access ports

Alibaba Cloud Server installs and configures Tomcat and adds external network access ports

It was not the Double Eleven recently, and I bought an Alibaba Cloud server to play with it. However, after configuring tomcat and adding security group rules, I could not access it no matter what, and telnet could not get through. Fortunately, after a period of hard work, I successfully solved the problem. The following is a record of how to solve the problem of deploying tomcat on Alibaba Cloud for the first time so that it can be accessed from the external network and add port mapping. As long as you follow the blogger's steps, there will generally be no problem.

1. JAVA environment configuration

1.1 Download JDK and Tomcat

First we need to install jdk and tomcat, the addresses have been prepared for you, see below:

Check the Linux version: uname -a

# uname -a
Linux root 3.10.0-957.21.3.el7.x86_64 #1 SMP Tue Jun 18 16:35:19 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

If there is x86_64, it is 64-bit, if not, it is 32-bit

For 64-bit Linux, download jdk-8u231-linux-x64.tar.gz, for 32-bit, download jdk-8u231-linux-i586.tar.gz

JDK download address: https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

Tomcat download address: http://tomcat.apache.org/download-80

1.2 jdk configuration

1. Unzip the jdk installation package. After unzipping, we can see a jdk1.8.0_231 folder

tar -zxvf jdk-8u231-linux-x64.tar.gz

The unzipped file contains

2. Edit system environment variables:

Run vi /etc/profile to edit the system configuration file and set the Java environment variables.

Add at the bottom of the file:

Note: Punctuation and Paths

export JAVA_HOME=/usr/local/java/jdk1.8.0_231
export CLASSPATH=$JAVA_HOME/lib/
export PATH=$PATH:$JAVA_HOME/bin 

Save and exit

3. Reload the system configuration file

source /etc/profile

4. Check whether jdk is installed successfully: java -version

[root@root jdk1.8.0_231]# java -version
java version "1.8.0_231"
Java(TM) SE Runtime Environment (build 1.8.0_231-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.231-b11, mixed mode)
[root@root jdk1.8.0_231]#

1.2 Tomcat Configuration

1. Unzip the jdk installation package. After unzipping, we can see a folder called apache-tomcat-8.5.47

tar -zxvf apache-tomcat-8.5.47.tar.gz

Unzip the directory:

2. After installing JDK, Tomcat does not need to be configured again, just start it directly

Command: ./bin/startup.sh

We have configured jdk and tomcat to access Alibaba Cloud Server. We need to set up port mapping here. Don't worry, it's all ready for you. Look below:

2. Firewall operation commands

Here we need to open the firewall, otherwise your server is very dangerous on the public network and needs a firewall to protect it.

#Stop firewall
systemctl stop firewalld.service 
#Open firewall
systemctl start firewalld.service
#Disable firewall startup systemctl disable firewalld.service 
#View the default firewall status (not running when turned off, running when turned on)
firewall-cmd --state

But when it is turned on, this error may be reported

Failed to start firewalld.service: Unit firewalld.service is masked.

Enter the following command:

systemctl unmask firewalld.service

2. Check whether it is accessible

If you are like the blogger at the beginning and still cannot access after adding security group rules, you can temporarily close the firewall to see if you can access it. If you can access it, it means the port problem. If you cannot access it, it means Tomcat problem

After starting tomcat, we can use the curl command to check whether the port and IP are accessible

#Start tomcat, in the tomcat directory bin/startup.sh
#Shut down tomcat, in the tomcat directory bin/shutdown.sh
#If the shutdown fails, you can kill the thread ps -ef | grep tomcat
kill -9 8080
#Access curl 127.0.0.1:8080
curl ip:8080

We can also use the ping and telnet commands under Windows to check whether the port and IP are accessible

Order:

# ping ip to check whether the IP is accessible (enter Alibaba Cloud IP)
ping 127.0.0.1 
# telnet to check whether the IP and port are accessible (enter Alibaba Cloud IP and port)
telnet 127.0.0.1 8080 

If it fails, please see below

3. Add security group rules

2.1 Adding Authorization Objects

1. Log in to Alibaba Cloud, find the cloud server, and click

2. Find the instance of our server, click More > Network and Security Group > Security Group Configuration

3. Click Configure Rules

4. Click Add Security Group Rule

5. Add security group rules

5. After adding successfully, the data we just added will appear in the list

When we add successfully, at this time, we cannot access the tomcat external network port, we also need to add the server internal open port

4. Add Linux open ports

Just use the following command to access port 8080

/sbin/iptables -I INPUT -p tcp --dport 8080 -j ACCEPT

5. Access tomcat

Finally, we enter our IP address and access is successful:

Summarize

The above is the tutorial on how to install and configure Tomcat on Alibaba Cloud Server and add an external network access port. I hope it will be helpful to you. If you have any questions, please leave me a message and I will reply to you in time. I would also like to thank everyone for their support of the 123WORDPRESS.COM website!
If you find this article helpful, please feel free to reprint it and please indicate the source. Thank you!