Teach you how to build virtual machines locally and deploy microservices

Every day in the morning It's seven thirty , Push dry goods on time

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A fan used to play a lot about virtual machines , But rarely summarized , Easy to forget , Today, it's just a one-stop summary ！

One 、 Introduce

Usually we develop good projects , It is usually tested locally , And then put the project war The package is handed over to the operation and maintenance department or passed ​​jenkins​​ And other construction tools are published to the corresponding server resources .

For production environment , We may use the server resources of the cloud manufacturer , Of course, it would be better if the company had its own computer room .

however For the test environment , Especially small businesses , It is expensive to purchase a ECS resource for testing alone , We usually use virtual software to partition a local computer into several separate resource environments , To save resources 、 Purpose of saving money .

Recently, I was just tossing about the installation and configuration of virtual machines , To be honest, I encountered many pits , The main idea is to deploy several local microservices to virtual machines , Then test , See if the service can run normally ？

This time we use ​​VMware​​ Software , I chose the trial version ！

I won't introduce the installation step , Relatively simple , You can baidu yourself ！

After the virtual machine software is installed , In order to be consistent with the real production environment , The system image selected this time is ​​Centos 7.8​​​, You can directly access Alibaba cloud's image site ​​http://mirrors.aliyun.com/centos/7.8.2003/isos/x86_64/​​​, Download will be very fast , choice ​​CentOS-7-x86_64-Minimal-2003.iso​​ that will do .

Two 、 Install the image

• After downloading , open ​​VMware​​ Software , Click create new virtual machine .

• Select the recommended configuration

• Select the downloaded system image

And then click next , Until completion , Wait for the virtual machine to be created and installed successfully ！

The installation process is a fool's operation , I installed three on this machine , Relatively simple ！

The key point is the network environment configuration , Let's take a look .

3、 ... and 、 Introduction to the Internet

After virtual machine installation , You need to configure the corresponding network to get online ,​​VMware​​ It provides us with two network configuration schemes , One is ： Bridging mode , The other is ：NAT Pattern .

3.1、 Bridging mode （ recommend ）

Bridging mode , To put it simply , Is to create a separate host in a LAN , He can access all the hosts in this lan , But you need to manually configure the subnet mask 、 gateway 、DNS etc. , And it is in the same network segment as the real host , In this model , Virtual machines and host computers can interact with each other ping through .

3.3、NAT Pattern

NAT Pattern , To put it simply , The virtual machine accesses the external network through the network of the host , Virtual network wants to access the Internet , You have to go through the host IP Address , Both host and virtual machine are external IP Address , Therefore, other machines in the LAN cannot connect to the virtual machine .

Four 、 Environment configuration

After understanding the introduction of network configuration , It is obvious that , What we need is that machines in the whole LAN can access virtual machines , Therefore, the virtual machine needs to configure the bridge mode to access the Internet .

• Click edit , Choose virtual network editor

• Click change settings

• Choose VMnet0, choice Bridging mode , And choose the corresponding Host network card

• It is very important to obtain the host network card information , If you don't know which one to choose , You can view it through the task manager

• After the virtual network editor is configured , Click a single virtual machine to set the network

• Choose bridge mode , Connect to the network

• Enter ​​ipconfig /all​​ Get the subnet mask of the host 、 gateway 、DNS Etc , It is convenient for subsequent virtual machine configuration

• Finally, log in to the terminal virtual machine for network configuration

Log in and copy

       

        # Edit the information of the corresponding network card in the virtual machine （centos7）
        
vi /etc/sysconfig/network-scripts/ifcfg-ens33
        

        

        
# If it is centos6, Edit the file as follows 
        
vi /etc/sysconfig/network-scripts/ifcfg-eth0
       
       

        
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• Add the following information at the end of the file , The default is dynamic acquisition IP

Log in and copy

       

        ONBOOT=yes     # Turn on auto enable network connection 
        
NETMASK=255.255.252.0   # Set subnet mask （ Subnet mask in the host ）
        
GATEWAY=197.168.24.1    # Set up the gateway （ Gateway in the host ）
        
DNS1=197.168.12.2           # Set master DNS（ In the host DNS The server ）
       
       

        
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• Of course, you can also configure static IP Address , modify ​​BOOTPROTO​​ Parameters

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Log in and copy

       

        BOOTPROTO=static  # Enable static IP Address , The default is dhcp, Show dynamic 
       
       

        
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• Set static IP Address , With the host IP In the same network segment

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Log in and copy

       

        IPADDR=197.168.24.201    # Set static IP Address 
        
ONBOOT=yes       # Turn on auto enable network connection 
        
NETMASK=255.255.252.0   # Set subnet mask （ Subnet mask in the host ）
        
GATEWAY=197.168.24.1    # Set up the gateway （ Gateway in the host ）
        
DNS1=197.168.12.2           # Set master DNS（ In the host DNS The server ）
       
       

        
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• After saving successfully , Restart NIC

Log in and copy

       

        systemctl restart network
       
       

        
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• Finally, test whether you can surf the Internet , If there is a return message , You can surf the Internet

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Log in and copy

       

        ping www.baidu.com
       
       

        
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• Input ​​ip addr​​ Check out the Internet

• You can also use ​​ifconfig​​ command , If there is no command found , You can install it with the following commands

Log in and copy

       

        # install net-tools
        
yum install net-tools
       
       

        
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5、 ... and 、 Project deployment

After the network configuration is completed , You can install the service 、 The project has been deployed .

• Enter the following command , install JDK

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        yum -y install java-1.8.0-openjdk
       
       

        
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• Input ​​java -version​​ Check whether the installation is successful

• Use ​​winScp​​​ Tools will ​​jar​​​ perhaps ​​war​​ Upload the package to the server directory

• Use ​​xshell​​ Command tools such as remote login server , Enter the command to start the service

Log in and copy

       

        # Start a jar service , Print log to service.log In file 
        
nohup java -jar service.jar > service.log 2>&1 &
       
       

        
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• In case of remote inaccessibility , Check if the firewall is on , If on, turn it off

Log in and copy

       

        # Check if the firewall is on 
        
systemctl status firewalld.service
        

        

        
# Turn off firewall 
        
systemctl stop firewalld.service
        

        

        
# It is forbidden to start the firewall automatically 
        
systemctl disable firewalld.service
       
       

        
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6、 ... and 、 summary

The whole content is more , They were all tested by themselves , In particular, there are many holes in the network configuration , When configuring the network , Be sure to check which network card of the host is surfing the Internet , Then select the network card type when configuring the bridge mode ！

If there is something wrong , Hope netizens criticize and point out ！

7、 ... and 、 Reference resources

1、 Autumn night rain lane - VMWare Virtual machine network configuration