Reasons and solutions for why GitLab configured in the virtual machine cannot be accessed

In daily development, many people may use virtual machines to build some development environments, such as building a GitLab private warehouse to facilitate the management of internal code within the enterprise. However, during the configuration process, some people will encounter a problem: GitLab configured in the virtual machine cannot be accessed. What should I do? This article will explain the solution to this problem in detail from several aspects.

1. Confirm the network configuration

First, we need to confirm whether the network configuration of the virtual machine is correct. In terms of network configuration, virtual machines can choose from a variety of network connection methods, such as bridging, NAT, host network, etc. The bridge connection method directly connects the virtual machine to the LAN where the host is located, while NAT uses the IP address of the virtual machine to communicate with the host. Therefore, if we choose the NAT connection method, we cannot directly use the host's IP address to access GitLab in the virtual machine, because in this way the virtual machine's IP is assigned by the virtual machine itself. If we choose the bridge connection method, we need to pay attention to whether the network segment where the virtual machine is located is in the same network segment as the host. If they are not on the same network segment, you need to further configure the gateway and other information in the virtual machine network.

2. Confirm the GitLab configuration

If there is no problem with the network connection configuration, there may be a problem with the GitLab configuration. We need to confirm whether the domain name or IP address of GitLab is set correctly. You can test the accessibility of GitLab by using the curl command in the virtual machine, for example, use the following command:

curl http://localhost/

If the homepage of GitLab is returned, it means that GitLab is correctly configured on the local server. You can use localhost or local IP to access. But if it is accessed on another machine, you need to configure GitLab in the virtual machine to be accessible on the network. For example, add the following configuration to the configuration file:

gitlab_rails['gitlab_host'] = '192.168.0.100'

where 192.168.0.100 is the virtual machine The IP address assigned to the machine can be used to access GitLab on other machines only through this address.

3. Confirm the firewall configuration

Finally, we need to check whether there are any problems with the firewall configuration. When building GitLab in a virtual machine, you may need to open some ports, such as 22 (SSH), 80 (HTTP), 443 (HTTPS), etc. If you have firewall software installed, you need to allow access to these ports when configuring the firewall. For example, in centos7, you can open the corresponding port through the following command:

$ sudo firewall-cmd --permanent --add-port=80/tcp
$ sudo firewall-cmd --reload

If you still cannot access it after the above steps, you can consider executing the following command to clear the DNS cache in the virtual machine:

$ sudo systemctl restart dnsmasq

The possible reason is that the DNS record is invalid and the DNS cache needs to be refreshed so that it can obtain the latest record from the new DNS service again.

Summary

In the process of configuring GitLab in a virtual machine, it is common to encounter inaccessibility. However, as long as we carefully investigate and solve it, we can still enjoy the convenience and efficiency brought by virtual machines. Therefore, the above methods only provide some possible solutions, and readers can choose and try them according to the actual situation.

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