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Building FRR on CentOS 7 from Git Source
========================================
(As an alternative to this installation, you may prefer to create a FRR
rpm package yourself and install that package instead. See instructions
in redhat/README.rpm_build.md on how to build a rpm package)
CentOS 7 restrictions:
----------------------
- MPLS is not supported on `CentOS 7` with default kernel. MPLS requires
Linux Kernel 4.5 or higher (LDP can be built, but may have limited use
without MPLS)
Install required packages
-------------------------
Add packages:
sudo yum install git autoconf automake libtool make gawk \
readline-devel texinfo net-snmp-devel groff pkgconfig \
json-c-devel pam-devel bison flex pytest c-ares-devel \
perl-XML-LibXML python-devel
Get FRR, compile it and install it (from Git)
---------------------------------------------
**This assumes you want to build and install FRR from source and not using
any packages**
### Add frr groups and user
sudo groupadd -g 92 frr
sudo groupadd -r -g 85 frrvt
sudo useradd -u 92 -g 92 -M -r -G frrvt -s /sbin/nologin \
-c "FRR FRRouting suite" -d /var/run/frr frr
### Download Source, configure and compile it
(You may prefer different options on configure statement. These are just
an example.)
git clone https://github.com/frrouting/frr.git frr
cd frr
./bootstrap.sh
./configure \
--bindir=/usr/bin \
--sbindir=/usr/lib/frr \
--sysconfdir=/etc/frr \
--libdir=/usr/lib/frr \
--libexecdir=/usr/lib/frr \
--localstatedir=/var/run/frr \
--with-moduledir=/usr/lib/frr/modules \
--enable-pimd \
--enable-snmp=agentx \
--enable-multipath=64 \
--enable-ospfclient=yes \
--enable-ospfapi=yes \
--enable-user=frr \
--enable-group=frr \
--enable-vty-group=frrvt \
--enable-rtadv \
--disable-exampledir \
--enable-watchfrr \
--disable-ldpd \
--enable-fpm \
--enable-nhrpd \
--enable-eigrpd \
--enable-babeld \
--with-pkg-git-version \
--with-pkg-extra-version=-MyOwnFRRVersion
make
make check
sudo make install
### Create empty FRR configuration files
sudo mkdir /var/log/frr
sudo mkdir /etc/frr
sudo touch /etc/frr/zebra.conf
sudo touch /etc/frr/bgpd.conf
sudo touch /etc/frr/ospfd.conf
sudo touch /etc/frr/ospf6d.conf
sudo touch /etc/frr/isisd.conf
sudo touch /etc/frr/ripd.conf
sudo touch /etc/frr/ripngd.conf
sudo touch /etc/frr/pimd.conf
sudo touch /etc/frr/nhrpd.conf
sudo touch /etc/frr/eigrpd.conf
sudo touch /etc/frr/babeld.conf
sudo chown -R frr:frr /etc/frr/
sudo touch /etc/frr/vtysh.conf
sudo chown frr:frrvt /etc/frr/vtysh.conf
sudo chmod 640 /etc/frr/*.conf
### Install daemon config file
sudo install -p -m 644 redhat/daemons /etc/frr/
sudo chown frr:frr /etc/frr/daemons
### Edit /etc/frr/daemons as needed to select the required daemons
Look for the section with `watchfrr_enable=...` and `zebra=...` etc.
Enable the daemons as required by changing the value to `yes`
### Enable IP & IPv6 forwarding
Create a new file `/etc/sysctl.d/90-routing-sysctl.conf` with the
following content:
# Sysctl for routing
#
# Routing: We need to forward packets
net.ipv4.conf.all.forwarding=1
net.ipv6.conf.all.forwarding=1
Load the modifed sysctl's on the system:
sudo sysctl -p /etc/sysctl.d/90-routing-sysctl.conf
### Install frr Service and redhat init files
sudo install -p -m 644 redhat/frr.service /usr/lib/systemd/system/frr.service
sudo install -p -m 755 redhat/frr.init /usr/lib/frr/frr
### Register the systemd files
sudo systemctl preset frr.service
### Enable required frr at startup
sudo systemctl enable frr
### Reboot or start FRR manually
sudo systemctl start frr
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