I am trying to set up a test environment on my local machine, and I am trying to start a DNS daemon that loads tha configuration from a named.conf.custom file.

As long as the size of that file is like 3-4 zones, the bind9 daemon loads fine, but when i enter the config file i need (like 10000 lines long), bind can't startup and in the syslog i find this message:

starting BIND 9.7.0-P1 -u bind
Jun 14 17:06:06 cibionte-pc named[9785]: built with '--prefix=/usr' '--mandir=/usr/share/man' '--infodir=/usr/share/info' '--sysconfdir=/etc/bind' '--localstatedir=/var' '--enable-threads' '--enable-largefile' '--with-libtool' '--enable-shared' '--enable-static' '--with-openssl=/usr' '--with-gssapi=/usr' '--with-gnu-ld' '--with-dlz-postgres=no' '--with-dlz-mysql=no' '--with-dlz-bdb=yes' '--with-dlz-filesystem=yes' '--with-dlz-ldap=yes' '--with-dlz-stub=yes' '--with-geoip=/usr' '--enable-ipv6' 'CFLAGS=-fno-strict-aliasing -DDIG_SIGCHASE -O2' 'LDFLAGS=-Wl,-Bsymbolic-functions' 'CPPFLAGS='
Jun 14 17:06:06 cibionte-pc named[9785]: adjusted limit on open files from 1024 to 1048576
Jun 14 17:06:06 cibionte-pc named[9785]: found 1 CPU, using 1 worker thread
Jun 14 17:06:06 cibionte-pc named[9785]: using up to 4096 sockets
Jun 14 17:06:06 cibionte-pc named[9785]: loading configuration from '/etc/bind/named.conf'
Jun 14 17:06:06 cibionte-pc named[9785]: /etc/bind/named.conf.saferinternet:1: unknown option 'zone'
Jun 14 17:06:06 cibionte-pc named[9785]: loading configuration: failure
Jun 14 17:06:06 cibionte-pc named[9785]: exiting (due to fatal error)

Are there any limits on the file size bind9 is allowed to load?