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安装配置Keepalived - v2

本系列包括架设Real Server和Keepalived Server、nginx负载平衡

OS: AlmaLinux/RockyLinux minimal(VBox v6.1.38)

Virtual Box Network configure:

  • Attached to
Bridged Adapter
  • Advanced
    promiscuous mode:
Allow All

一、安装

prepare tool:

  • RHEL7
#yum install gcc make autoconf automake openssl-devel libnl3-devel \
    iptables-devel ipset-devel net-snmp-devel libnfnetlink-devel file-devel \
    glib2-devel pcre2-devel libnftnl-devel libmnl-devel systemd-devel kmod-devel
  • RHEL8
    powertools:
#dnf --enablerepo=powertools install ipset-devel libnfnetlink-devel file-devel libnftnl-devel kmod-devel pcre2-devel

none:

#dnf install gcc make autoconf automake openssl-devel libnl3-devel \
    iptables-devel net-snmp-devel \
    glib2-devel libmnl-devel systemd-devel git

LVS manager:

#dnf install ipvsadm

Reboot the machine so that kmod takes effect!
Otherwise, it will show:

Keepalived_healthcheckers[25270]: kmod_module_new_from_lookup failed - err 38

installation

state(vrrp_instance) - config:

  • MASTER
    Node 1
  • BACKUP
    Node 2

down and unzip

Released Version: 2.2.7

$git clone https://github.com/acassen/keepalived.git

for me:

$git clone https://gitee.com/xiaobin80/keepalived

installation

$cd keepalived
$./autogen.sh

configure:

$./configure --prefix=/usr

make:

$make

Root permission Required

#make install

setup

#mkdir -p /etc/keepalived
$sudo mv /etc/keepalived/keepalived.conf.sample /etc/keepalived/keepalived.conf
$sudo cp ./keepalived/etc/init.d/keepalived /etc/init.d/
$sudo chmod 755 /etc/init.d/keepalived
  • test
$keepalived -v

Security Options

allow fire wall port:

#firewall-cmd --permanent --zone=public --add-port=80/tcp
#firewall-cmd --reload

selinux

#vi /etc/selinux/config

更改enforcing为disabled:

SELINUX=disabled

二、配置

Table 4.1. lv_algo Values for Virtual Server

Algorithm Name lv_algo value
Round-Robin rr
Weighted Round-Robin wrr
Least-Connection lc
Weighted Least-Connection wlc
Locality-Based Least-Connection lblc
Locality-Based Least-Connection Scheduling with Replication lblcr
Destination Hash dh
Source Hash sh
Source Expected Delay sed
Never Queue nq

Direct Routing

example

/etc/keepalived/keepalived.conf

global_defs {
    max_auto_priority
}

vrrp_instance VI_1 {
    state MASTER
    interface enp0s3
    virtual_router_id 49
    priority 200
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass passw123
    }
    virtual_ipaddress {
        192.168.0.220/24
    }
}

virtual_server 192.168.0.220 80 {
    delay_loop 6
    lb_algo wrr
    lb_kind DR
    persistence_timeout 9600
    protocol TCP

    real_server 192.168.0.127 80 {
        weight 3
        TCP_CHECK {
            connect_timeout 10
            retry 3
            delay_before_retry 3
            connect_port 80
        }
    }

    real_server 192.168.0.122 80 {
        weight 1
        TCP_CHECK {
            connect_timeout 10
            retry 3
            delay_before_retry 3
            connect_port 80
        }
    }
}

priority

  • node 1
200
  • node 2
150

Reference