Resolving hostnames locally

Resolving hostnames locally enables you to display hostnames in the log files for frequently used hosts, without having to rely on a DNS server. The known IP address -- hostname pairs are stored locally in a file. In the log messages, syslog-ng OSE will replace the IP addresses of known hosts with their hostnames.

To configure local name resolution, complete the following steps:

Steps

1. Add the hostnames and the respective IP addresses to the file used for local name resolution. On Linux and UNIX systems, this is the /etc/hosts file. Consult the documentation of your operating system for details.

2. Instruct syslog-ng OSE to resolve hostnames locally. Set the use-dns() option of syslog-ng OSE to persist_only.

3. Set the dns-cache-hosts() option to point to the file storing the hostnames.

    options {
        use-dns(persist_only);
        dns-cache-hosts(/etc/hosts);
    };