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Building FRR on CentOS 7 from Git Source
========================================
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
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 FreeRangeRouting 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.)
You may want to pay special attention to `/usr/lib64` paths and change
them if you are not building on a x86_64 architecture
git clone https://github.com/freerangerouting/frr.git frr
cd frr
git checkout stable/2.0
./bootstrap.sh
./configure \
--sysconfdir=/etc/frr \
--libdir=/usr/lib64/frr \
--libexecdir=/usr/lib64/frr \
--localstatedir=/var/run/frr \
--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 \
--enable-tcp-zebra \
--enable-fpm \
--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 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
### 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
**Reboot** or use `sysctl` to apply the same config to the running system
### Install Service files
sudo install -p -m 644 redhat/zebra.service /usr/lib/systemd/system/zebra.service
sudo install -p -m 644 redhat/isisd.service /usr/lib/systemd/system/isisd.service
sudo install -p -m 644 redhat/ripd.service /usr/lib/systemd/system/ripd.service
sudo install -p -m 644 redhat/ospfd.service /usr/lib/systemd/system/ospfd.service
sudo install -p -m 644 redhat/bgpd.service /usr/lib/systemd/system/bgpd.service
sudo install -p -m 644 redhat/ospf6d.service /usr/lib/systemd/system/ospf6d.service
sudo install -p -m 644 redhat/ripngd.service /usr/lib/systemd/system/ripngd.service
sudo install -p -m 644 redhat/pimd.service /usr/lib/systemd/system/pimd.service
sudo install -p -m 644 redhat/frr.sysconfig /etc/sysconfig/frr
sudo install -p -m 644 redhat/frr.logrotate /etc/logrotate.d/frr
### Register the systemd files
sudo systemctl preset zebra.service
sudo systemctl preset ripd.service
sudo systemctl preset ospfd.service
sudo systemctl preset bgpd.service
sudo systemctl preset ospf6d.service
sudo systemctl preset ripngd.service
sudo systemctl preset pimd.service
### Enable required daemons at startup
Only enable zebra and the daemons which are needed for your setup
sudo systemctl enable zebra
sudo systemctl enable ospfd
sudo systemctl enable bgpd
[...] etc (as needed)
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