16.4. Configuring a Domain Blacklist in Squid

Frequently, administrators want to block access to specific domains. This section describes how to configure a domain blacklist in Squid.

Prerequisites

Squid is configured, and users can use the proxy.

Procedure

Edit the /etc/squid/squid.conf file and add the following settings:
```
acl domain_blacklist dstdomain "/etc/squid/domain_blacklist.txt"
http_access deny all domain_blacklist
```
Important
Add these entries before the first http_access allow statement that allows access to users or clients.
Create the /etc/squid/domain_blacklist.txt file and add the domains you want to block. For example, to block access to example.com including subdomains and to block example.net, add:
```
.example.com
example.net
```
Important
If you referred to the /etc/squid/domain_blacklist.txt file in the squid configuration, this file must not be empty. If the file is empty, Squid fails to start.
Restart the squid service:
```
# systemctl restart squid
```

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