【Linux】【Services】【Project】Haproxy Keepalived Postfix实现邮件网关Cluster

1. 简介：

1.1. 背景：公司使用exchange服务器作为邮件服务器，但是使用Postfix作为邮件网关实现病毒检测，内容过滤，反垃圾邮件等功能。原来的架构非常简单，只有两台机器，一个负责进公司的邮件，一个负责发公司到外部的邮件。由于公司人员增长迅速，再加上机房的迁移，原来的架构已经不能满足公司现有需要，需要重新设计一套邮件网关系统。

1.2. 基础概念：

1.2.1. postfix

1.2.2. haproxy:

1.2.3. keepalived:

1.2.4. clamav:

1.2.5. amavisd:

1.2.6. spamassassin:

1.2.7. SPF:

2. 环境：

2.1. OS: Red Hat Enterprise Linux Server release 7.3 (Maipo)

2.2. Kernel: 3.10.0-514.2.2.el7.x86_64

2.3. Haproxy: 1.5.18-3.el7_3.1

2.4. keepalived: 1.2.13-8.el7

2.5. 服务器

Server Name	IP	Software Installed	Comments
HCWHMAILPROXY01	10.25.8.2	postfix, amavisd,clamd,spamassassin,spf
HCWHMAILPROXY02	10.25.8.3	postfix, amavisd,clamd,spamassassin,spf
HCWHMAILPROXY03	10.25.8.4	postfix, amavisd,clamd,spamassassin,spf
HCWHMAILPROXY04	10.25.8.5	postfix, amavisd,clamd,spamassassin,spf
HCWHMAILDR01	10.25.2.45	haproxy
HCWHMAILDR01	10.25.2.22	keepalived	VIP
HCWHMAILDR02	10.25.2.46	haproxy
HCWHMAILDR02	10.25.2.23	keepalived	VIP

2.6. 网络信息

name	IP	Software	Managed by	Comments
F5		F5	Network	need DNS name and IP from outbound
lease line			Network
DNS	10.24.2.1	bind	Run Linux	resolve mailproxy.homecredit.cn to 10.25.2.22/23

3. 安装：

3.1. 调度器hcwhmaildr01/02, 配置好yum源之后可以直接安装

#直接安装就可以
[root@hcwhmaildr01 ~]# yum install keepalived haproxy -y
#记得开机启动并测试一下是否可以默认启动
[root@hcwhmaildr01 ~]# systemctl enable keepalived.service
Created symlink from /etc/systemd/system/multi-user.target.wants/keepalived.service to /usr/lib/systemd/system/keepalived.service.
[root@hcwhmaildr01 ~]# systemctl start keepalived.service
[root@hcwhmaildr01 ~]# systemctl enable haproxy.service
Created symlink from /etc/systemd/system/multi-user.target.wants/haproxy.service to /usr/lib/systemd/system/haproxy.service.
[root@hcwhmaildr01 ~]# systemctl start haproxy.service
[root@hcwhmaildr01 ~]# 

keepalive配置文件 hcwhmaildr01

global_defs {
   notification_email {
     linux@homecredit.cn
   }
   notification_email_from zabbix@homecredit.cn
   smtp_server smtp.homecredit.cn
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}


vrrp_script check_haproxy {
script "killall -0 haproxy"
        interval 1
        weight 21
}

vrrp_script chk_mantaince_down {
   script "[[ -f /etc/keepalived/down ]] && exit 1 || exit 0"
   interval 1
   weight 2
}


vrrp_instance VI_22 {
    state MASTER
    interface ens192
    virtual_router_id 22
    garp_master_delay 1
    mcast_src_ip 10.25.2.45
    lvs_sync_daemon_interface ens192
    priority 110
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    track_interface {
    ens192
    }
    virtual_ipaddress {
        10.25.2.22/24 dev ens192 label ens192:0
    }
    track_script {
    check_haproxy
    chk_mantaince_down
    }
}

vrrp_instance VI_23 {
    state BACKUP
    interface ens192
    virtual_router_id 23
    garp_master_delay 1
    mcast_src_ip 10.25.2.45
    lvs_sync_daemon_interface ens192
    priority 100
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    track_interface {
        ens192
    }
    virtual_ipaddress {
        10.25.2.23/24 dev ens192 label ens192:1
    }
    track_script {
    check_haproxy
    chk_mantaince_down
    }
}

 keepalive配置文件 hcwhmaildr02

global_defs {
   notification_email {
     linux@homecredit.cn
   }
   notification_email_from zabbix@homecredit.cn
   smtp_server smtp.homecredit.cn
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}


vrrp_script check_haproxy {
script "killall -0 haproxy"
        interval 1
        weight 21
}

vrrp_script chk_mantaince_down {
   script "[[ -f /etc/keepalived/down ]] && exit 1 || exit 0"
   interval 1
   weight 2
}

vrrp_instance VI_22 {
    state BACKUP
    interface ens192
    virtual_router_id 22
    garp_master_delay 1
    mcast_src_ip 10.25.2.46
    lvs_sync_daemon_interface ens192
    priority 100
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    track_interface {
    ens192
    }
    virtual_ipaddress {
        10.25.2.22/24 dev ens192 label ens192:0
    }
    track_script {
    check_haproxy
    chk_mantaince_down
    }
}

vrrp_instance VI_23 {
    state MASTER
    interface ens192
    virtual_router_id 23
    garp_master_delay 1
    mcast_src_ip 10.25.2.46
    lvs_sync_daemon_interface ens192
    priority 110
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    track_interface {
        ens192
    }
    virtual_ipaddress {
        10.25.2.23/24 dev ens192 label ens192:1
    }
    track_script {
    check_haproxy
    chk_mantaince_down
    }
}

haproxy配置文件 hcwhmaildr01

global
    log         127.0.0.1 local3
    chroot      /var/lib/haproxy
    pidfile     /var/run/haproxy.pid
    maxconn     4000
    user        haproxy
    group       haproxy
    daemon
    stats socket /var/lib/haproxy/stats
defaults
    mode                    http
    log                     global
    option                  httplog
    option                  dontlognull
    option http-server-close
    option forwardfor       except 127.0.0.0/8
    option                  redispatch
    retries                 3
    timeout http-request    10s
    timeout queue           1m
    timeout connect         10s
    timeout client          1m
    timeout server          1m
    timeout http-keep-alive 10s
    timeout check           10s
    maxconn                 3000
listen smtp *:25
    mode    tcp
    balance     roundrobin
    server  hcwhmailproxy01 10.25.8.2:25 weight 1 maxconn 10000 check inter 10s
    server  hcwhmailproxy02 10.25.8.3:25 weight 1 maxconn 10000 check inter 10s
    server  hcwhmailproxy03 10.25.8.4:25 weight 1 maxconn 10000 check inter 10s
    server  hcwhmailproxy04 10.25.8.5:25 weight 1 maxconn 10000 check inter 10s
listen stats *:9001
    stats enable
    stats uri /haproxyadmin?stats
    stats realm HAProxy Statistics
    stats auth admin:admin
    stats admin if TRUE

haproxy配置文件 hcwhmaildr02

global
    log         127.0.0.1 local3
    chroot      /var/lib/haproxy
    pidfile     /var/run/haproxy.pid
    maxconn     4000
    user        haproxy
    group       haproxy
    daemon
    stats socket /var/lib/haproxy/stats
defaults
    mode                    http
    log                     global
    option                  httplog
    option                  dontlognull
    option http-server-close
    option forwardfor       except 127.0.0.0/8
    option                  redispatch
    retries                 3
    timeout http-request    10s
    timeout queue           1m
    timeout connect         10s
    timeout client          1m
    timeout server          1m
    timeout http-keep-alive 10s
    timeout check           10s
    maxconn                 3000
listen smtp *:25
    mode    tcp
    balance     roundrobin
    server  hcwhmailproxy01 10.25.8.2:25 weight 1 maxconn 10000 check inter 10s
    server  hcwhmailproxy02 10.25.8.3:25 weight 1 maxconn 10000 check inter 10s
    server  hcwhmailproxy03 10.25.8.4:25 weight 1 maxconn 10000 check inter 10s
    server  hcwhmailproxy04 10.25.8.5:25 weight 1 maxconn 10000 check inter 10s
listen stats *:9001
    stats enable
    stats uri /haproxyadmin?stats
    stats realm HAProxy Statistics
    stats auth admin:admin
    stats admin if TRUE

3.2 postfix,amavisd-new, clamav, spamassassin, spf(python和perl版本的我都装上了)，还有qshape命令postfix-perl-scripts

yum install perl-Mail-SPF,python-pyspf,postfix, spamassassin, clamav, amavisd-new, postfix-perl-scripts

/etc/postfix/mail.cf

alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/libexec/postfix
data_directory = /var/lib/postfix
debug_peer_level = 2
debugger_command = PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin ddd $daemon_directory/$process_name $process_id 
& sleep 5html_directory = no
inet_interfaces = all
inet_protocols = all
mail_owner = postfix
mailq_path = /usr/bin/mailq.postfix
manpage_directory = /usr/share/man
mydestination = $myhostname, localhost.$mydomain, localhost
newaliases_path = /usr/bin/newaliases.postfix
queue_directory = /var/spool/postfix
readme_directory = /usr/share/doc/postfix-2.10.1/README_FILES
sample_directory = /usr/share/doc/postfix-2.10.1/samples
sendmail_path = /usr/sbin/sendmail.postfix
setgid_group = postdrop
unknown_local_recipient_reject_code = 550

# 主机设置 
mydestination = $myhostname, localhost.$mydomain, localhost 
mynetworks_style = subnet
# 立即响应 
smtpd_error_sleep_time = 0s 
# 邮件大小和邮箱大小限制10M、2G 
message_size_limit = 10485760 
mailbox_size_limit = 2097152000 
show_user_unknown_table_name = no 
# 队列超时限制 1天 
bounce_queue_lifetime = 1d 
maximal_queue_lifetime = 1d

#HCC configuration
myhostname = hcwumailproxy01.homecredit.cn
transport_maps = hash:/etc/postfix/transport
relay_domains = homecredit.cn, shenzhen.homecredit.cn, ppf.cn, homecreditcfc.cn, hctest.cn
mynetworks = 10.24.0.0/16, 10.25.0.0/16, 10.26.0.0/16, 10.27.0.0/16, 10.31.0.0/16, 127.0.0.0/8, 10.30.0.0/16, 10.65.
0.0/16, 10.64.0.0/16mydomain = homecredit.cn 
myorigin = $mydomain
masquerade_domains = homecredit.cn
masquerade_exceptions = root

# SMTP 收件方限制
smtpd_recipient_restrictions =
        permit_mynetworks,       
        permit_sasl_authenticated,       
        reject_non_fqdn_hostname,
        reject_non_fqdn_sender,
        reject_non_fqdn_recipient,
        reject_unauth_destination,
        reject_unauth_pipelining,
        reject_invalid_hostname,
    check_recipient_access hash:/etc/postfix/recipient_access
    check_policy_service unix:private/policy-spf

# SMTP 发件方限制
smtpd_sender_restrictions = check_sender_access hash:/etc/postfix/sender_access
# Header Check
header_checks = regexp:/etc/postfix/header_checks
# mailbox limit
#message_size_limit = 67108846
#mailbox_size_limit = 1024000000
canonical_maps = hash:/etc/postfix/canonical

/etc/postfix/master.cf

#
# Postfix master process configuration file.  For details on the format
# of the file, see the master(5) manual page (command: "man 5 master").
#
# Do not forget to execute "postfix reload" after editing this file.
#
# ==========================================================================
# service type  private unpriv  chroot  wakeup  maxproc command + args
#               (yes)   (yes)   (yes)   (never) (100)
# ==========================================================================
smtp      inet  n       -       n       -       -       smtpd
#smtp      inet  n       -       n       -       1       postscreen
#smtpd     pass  -       -       n       -       -       smtpd
#dnsblog   unix  -       -       n       -       0       dnsblog
#tlsproxy  unix  -       -       n       -       0       tlsproxy
#submission inet n       -       n       -       -       smtpd
#  -o syslog_name=postfix/submission
#  -o smtpd_tls_security_level=encrypt
#  -o smtpd_sasl_auth_enable=yes
  -o receive_override_options=no_address_mappings
  -o content_filter=smtp-amavis:127.0.0.1:10024
#  -o smtpd_reject_unlisted_recipient=no
#  -o smtpd_client_restrictions=$mua_client_restrictions
#  -o smtpd_helo_restrictions=$mua_helo_restrictions
#  -o smtpd_sender_restrictions=$mua_sender_restrictions
#  -o smtpd_recipient_restrictions=permit_sasl_authenticated,reject
#  -o milter_macro_daemon_name=ORIGINATING
#smtps     inet  n       -       n       -       -       smtpd
#  -o syslog_name=postfix/smtps
#  -o smtpd_tls_wrappermode=yes
#  -o smtpd_sasl_auth_enable=yes
#  -o smtpd_reject_unlisted_recipient=no
#  -o smtpd_client_restrictions=$mua_client_restrictions
#  -o smtpd_helo_restrictions=$mua_helo_restrictions
#  -o smtpd_sender_restrictions=$mua_sender_restrictions
#  -o smtpd_recipient_restrictions=permit_sasl_authenticated,reject
#  -o milter_macro_daemon_name=ORIGINATING
#628       inet  n       -       n       -       -       qmqpd
pickup    unix  n       -       n       60      1       pickup
cleanup   unix  n       -       n       -       0       cleanup
qmgr      unix  n       -       n       300     1       qmgr
#qmgr     unix  n       -       n       300     1       oqmgr
tlsmgr    unix  -       -       n       1000?   1       tlsmgr
rewrite   unix  -       -       n       -       -       trivial-rewrite
bounce    unix  -       -       n       -       0       bounce
defer     unix  -       -       n       -       0       bounce
trace     unix  -       -       n       -       0       bounce
verify    unix  -       -       n       -       1       verify
flush     unix  n       -       n       1000?   0       flush
proxymap  unix  -       -       n       -       -       proxymap
proxywrite unix -       -       n       -       1       proxymap
smtp      unix  -       -       n       -       -       smtp
relay     unix  -       -       n       -       -       smtp
#       -o smtp_helo_timeout=5 -o smtp_connect_timeout=5
showq     unix  n       -       n       -       -       showq
error     unix  -       -       n       -       -       error
retry     unix  -       -       n       -       -       error
discard   unix  -       -       n       -       -       discard
local     unix  -       n       n       -       -       local
virtual   unix  -       n       n       -       -       virtual
lmtp      unix  -       -       n       -       -       lmtp
anvil     unix  -       -       n       -       1       anvil
scache    unix  -       -       n       -       1       scache
#
# ====================================================================
# Interfaces to non-Postfix software. Be sure to examine the manual
# pages of the non-Postfix software to find out what options it wants.
#
# Many of the following services use the Postfix pipe(8) delivery
# agent.  See the pipe(8) man page for information about ${recipient}
# and other message envelope options.
# ====================================================================
#
# maildrop. See the Postfix MAILDROP_README file for details.
# Also specify in main.cf: maildrop_destination_recipient_limit=1
#
#maildrop  unix  -       n       n       -       -       pipe
#  flags=DRhu user=vmail argv=/usr/local/bin/maildrop -d ${recipient}
#
# ====================================================================
#
# Recent Cyrus versions can use the existing "lmtp" master.cf entry.
#
# Specify in cyrus.conf:
#   lmtp    cmd="lmtpd -a" listen="localhost:lmtp" proto=tcp4
#
# Specify in main.cf one or more of the following:
#  mailbox_transport = lmtp:inet:localhost
#  virtual_transport = lmtp:inet:localhost
#
# ====================================================================
#
# Cyrus 2.1.5 (Amos Gouaux)
# Also specify in main.cf: cyrus_destination_recipient_limit=1
#
#cyrus     unix  -       n       n       -       -       pipe
#  user=cyrus argv=/usr/lib/cyrus-imapd/deliver -e -r ${sender} -m ${extension} ${user}
#
# ====================================================================
#
# Old example of delivery via Cyrus.
#
#old-cyrus unix  -       n       n       -       -       pipe
#  flags=R user=cyrus argv=/usr/lib/cyrus-imapd/deliver -e -m ${extension} ${user}
#
# ====================================================================
#
# See the Postfix UUCP_README file for configuration details.
#
#uucp      unix  -       n       n       -       -       pipe
#  flags=Fqhu user=uucp argv=uux -r -n -z -a$sender - $nexthop!rmail ($recipient)
#
# ====================================================================
#
# Other external delivery methods.
#
#ifmail    unix  -       n       n       -       -       pipe
#  flags=F user=ftn argv=/usr/lib/ifmail/ifmail -r $nexthop ($recipient)
#
#bsmtp     unix  -       n       n       -       -       pipe
#  flags=Fq. user=bsmtp argv=/usr/local/sbin/bsmtp -f $sender $nexthop $recipient
#
#scalemail-backend unix -       n       n       -       2       pipe
#  flags=R user=scalemail argv=/usr/lib/scalemail/bin/scalemail-store
#  ${nexthop} ${user} ${extension}
#
#mailman   unix  -       n       n       -       -       pipe
#  flags=FR user=list argv=/usr/lib/mailman/bin/postfix-to-mailman.py
#  ${nexthop} ${user}


#
# spam/virus section
#
smtp-amavis  unix  -    -       y       -       2       smtp
 -o smtp_data_done_timeout=1200
 -o disable_dns_lookups=yes
 -o smtp_send_xforward_command=yes
127.0.0.1:10025 inet n  -       y       -       -       smtpd
 -o content_filter=
 -o smtpd_helo_restrictions=
 -o smtpd_sender_restrictions=
 -o smtpd_recipient_restrictions=permit_mynetworks,reject
 -o mynetworks=127.0.0.0/8
 -o smtpd_error_sleep_time=0
 -o smtpd_soft_error_limit=1001
 -o smtpd_hard_error_limit=1000
 -o receive_override_options=no_header_body_checks
 -o smtpd_helo_required=no
 -o smtpd_client_restrictions=
 -o smtpd_restriction_classes=
 -o disable_vrfy_command=no
 -o strict_rfc821_envelopes=yes

#
# SPF
#
policy-spf  unix  -       n       n       -       -       spawn
     user=nobody argv=/usr/libexec/postfix/policyd-spf