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[lvs-users] Keepalived, LVS (dr) and ProFTPd
mark at streamservice
Nov 17, 2012, 6:43 PM
Post #1 of 1 (1148 views)
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Hello,

For me LVS is relatively new, I use keepalived since begin 2010. I now
combine LVS + keepalived with direct routing. For http/imap/smtp/pop3 this
works perfect. However for FTP (for me ProFTPd is important) I can't get
this to work.

I want to use direct routing where possible (I don't really like NAT).

In the data below the usernames and passwords are replaced, if something is
replaced the new content is located between [ and ].

Our setup is like this:
Router1-----------------------Router2
|
|
LB01-------------------------------LB02
|
|
FTP1-------------


Router1/Router2: running keepalived so we can keep internal traffic intern.
This are also firewalls and only contain static routes.
LB01/LB02: keepalived+LVS
FTP1: a single system running ProFTPd, maybe we add another FTP server in
the future

In this email I will provide information regarding LB01/LB02.

OS: Debian Wheezy (64bit)
Keepalived version: 1.2.2
Ipvsadm version: ipvsadm v1.26 2008/5/15 (compiled with popt and IPVS
v1.2.1)

As you can see below in our keepalived.conf we also run some other services
on this FTP server and we have separate caching nodes for http, soon I will
add https to the caching nodes and after that I also want to support that.
But one thing first, getting FTP to work (active+passive if possible).

I tried FTP in active and in passive mode (FileZilla is the FTP client
used). I can see it can connect for the first part and after that it fails,
below you can find the details:
Response: 220 ProFTPD 1.3.3d Server ready.
Command: USER [username]
Response: 331 Password required for [username]
Command: PASS [password]
Response: 230 User [username] logged in
Command: OPTS UTF8 ON
Response: 200 UTF8 set to on
Status: Connected
Status: Retrieving directory listing...
Command: PWD
Response: 257 "/" is the current directory
Command: TYPE I
Response: 200 Type set to I
Command: PASV
Response: 227 Entering Passive Mode (91,199,167,39,138,90).
Command: MLSD
Error: Connection timed out
Error: Failed to retrieve directory listing

root@LB01:~# lsmod | grep ip_vs
ip_vs_wrr 12613 0
ip_vs_wlc 12437 0
ip_vs_sh 12642 0
ip_vs_sed 12437 0
ip_vs_rr 12521 22
ip_vs_nq 12435 0
ip_vs_lc 12435 0
ip_vs_lblcr 13046 0
ip_vs_lblc 12894 0
ip_vs_ftp 12783 0
nf_nat 18242 3 ip_vs_ftp,iptable_nat,ipt_MASQUERADE
ip_vs_dh 12642 0
ip_vs 103967 44
ip_vs_dh,ip_vs_ftp,ip_vs_lblc,ip_vs_lblcr,ip_vs_lc,ip_vs_nq,ip_vs_rr,ip_vs_s
ed,ip_vs_sh,ip_vs_wlc,ip_vs_wrr
nf_conntrack 52720 5
ip_vs,nf_conntrack_ipv4,nf_nat,iptable_nat,ipt_MASQUERADE
libcrc32c 12426 1 ip_vs

root@LB01:~# Ipvsadm -l -n
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 91.199.167.39:20 rr persistent 300
-> 91.199.167.36:20 Route 100 0 0
TCP 91.199.167.39:21 rr persistent 300
-> 91.199.167.36:21 Route 100 0 0
TCP 91.199.167.39:25 rr
-> 91.199.167.36:25 Route 100 0 0
TCP 91.199.167.39:80 rr persistent 3600
-> 91.199.167.37:80 Route 100 0 147
-> 91.199.167.38:80 Route 100 3 120
TCP 91.199.167.39:110 rr
-> 91.199.167.36:110 Route 100 0 0
TCP 91.199.167.39:143 rr
-> 91.199.167.36:143 Route 100 1 0
TCP 91.199.167.39:587 rr
-> 91.199.167.36:25 Route 100 0 0
TCP 91.199.167.39:993 rr
-> 91.199.167.36:993 Route 100 0 0
TCP 91.199.167.39:995 rr
-> 91.199.167.36:995 Route 100 0 0
TCP 91.199.167.39:2222 rr
-> 91.199.167.36:2222 Route 100 0 0
TCP 91.199.167.39:10587 rr
-> 91.199.167.36:25 Route 100 0 0
TCP 91.199.167.40:80 rr persistent 3600
-> 91.199.167.37:80 Route 100 0 0
-> 91.199.167.38:80 Route 100 0 13
TCP 213.189.17.39:21 rr
-> 91.199.167.36:21 Route 100 0 0
TCP 213.189.17.39:25 rr
-> 91.199.167.36:25 Route 100 0 0
TCP 213.189.17.39:80 rr persistent 3600
-> 91.199.167.37:80 Route 100 0 0
-> 91.199.167.38:80 Route 100 0 0
TCP 213.189.17.39:110 rr
-> 91.199.167.36:110 Route 100 0 0
TCP 213.189.17.39:143 rr
-> 91.199.167.36:143 Route 100 6 0
TCP 213.189.17.39:587 rr
-> 91.199.167.36:25 Route 100 0 0
TCP 213.189.17.39:993 rr
-> 91.199.167.36:993 Route 100 2 0
TCP 213.189.17.39:995 rr
-> 91.199.167.36:995 Route 100 0 0
TCP 213.189.17.39:2222 rr
-> 91.199.167.36:2222 Route 100 0 0
TCP 213.189.17.39:10587 rr
-> 91.199.167.36:25 Route 100 0 0

Below you can find my /etc/keepalived/keepalived.conf.
global_defs {
lvs_id LVS_CLUSTER_01
}

vrrp_sync_group VG1 {
group {
CL01_VI_WAN
CL01_VI_VAR
CL01_VI_LAN
}
}

# Cluster IPs WAN
vrrp_instance CL01_VI_WAN {
state MASTER
interface eth0
virtual_router_id 101
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass [password]
}
virtual_ipaddress {
91.199.167.39
91.199.167.40
213.189.17.39
}
}

# Cluster IPv6 IPs WAN
vrrp_instance CL01_VI_WAN {
state MASTER
interface eth0
virtual_router_id 111
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass [password]
}
virtual_ipaddress {
2a00:0f10:0111:1::80:100/48 dev eth0
}
}

# Cluster IP LAN
vrrp_instance CL01_VI_LAN {
state MASTER
interface eth1
virtual_router_id 102
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass [password]
}
virtual_ipaddress {
10.125.0.1
}
}

# Cluster IP VARnish
vrrp_instance CL01_VI_LAN {
state MASTER
interface eth2
virtual_router_id 103
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass dfafddf
}
virtual_ipaddress {
10.125.2.1
10.125.2.5
}
}

virtual_server 91.199.167.39 80 {
delay_loop 6
lb_algo rr
lb_kind DR
persistence_timeout 3600
protocol TCP

# real_server 10.125.2.11 80 {
real_server 91.199.167.37 80 {
weight 100
TCP_CHECK {
connect_timeout 3
connect_port 80
}
}
real_server 91.199.167.38 80 {
weight 100
TCP_CHECK {
connect_timeout 3
connect_port 80
}
}
}

virtual_server 91.199.167.40 80 {
delay_loop 6
lb_algo rr
lb_kind DR
persistence_timeout 3600
protocol TCP

# real_server 10.125.2.11 80 {
real_server 91.199.167.37 80 {
weight 100
TCP_CHECK {
connect_timeout 3
connect_port 80
}
}
real_server 91.199.167.38 80 {
weight 100
TCP_CHECK {
connect_timeout 3
connect_port 80
}
}

virtual_server 213.189.17.39 80 {
delay_loop 6
lb_algo rr
lb_kind DR
persistence_timeout 3600
protocol TCP

# real_server 10.125.2.11 80 {
real_server 91.199.167.37 80 {
weight 100
TCP_CHECK {
connect_timeout 3
connect_port 80
}
}
real_server 91.199.167.38 80 {
weight 100
TCP_CHECK {
connect_timeout 3
connect_port 80
}
}
}

virtual_server 91.199.167.39 20 {
delay_loop 6
lb_algo rr
# lb_kind NAT
lb_kind DR
# nat_mask 255.255.255.0
protocol TCP
persistence_timeout 300

# real_server 10.125.0.200 21 {
real_server 91.199.167.36 20 {
weight 100
}
}

virtual_server 91.199.167.39 21 {
delay_loop 6
lb_algo rr
# lb_kind NAT
lb_kind DR
# nat_mask 255.255.255.0
protocol TCP
persistence_timeout 300

# real_server 10.125.0.200 21 {
real_server 91.199.167.36 21 {
weight 100
}
}

virtual_server 91.199.167.39 25 {
delay_loop 6
lb_algo rr
# lb_kind NAT
# nat_mask 255.255.255.0
protocol TCP

# real_server 10.125.0.200 25 {
real_server 91.199.167.36 25 {
weight 100
}
}

virtual_server 91.199.167.39 587 {
delay_loop 6
lb_algo rr
# lb_kind NAT
lb_kind DR
# nat_mask 255.255.255.0
protocol TCP

# real_server 10.125.0.200 25 {
real_server 91.199.167.36 25 {
weight 100
}
}

virtual_server 91.199.167.39 10587 {
delay_loop 6
lb_algo rr
# lb_kind NAT
lb_kind DR
# nat_mask 255.255.255.0
protocol TCP

# real_server 10.125.0.200 25 {
real_server 91.199.167.36 25 {
weight 100
}
}

virtual_server 91.199.167.39 110 {
delay_loop 6
lb_algo rr
# lb_kind NAT
lb_kind DR
# nat_mask 255.255.255.0
protocol TCP

# real_server 10.125.0.200 110 {
real_server 91.199.167.36 110 {
weight 100
}
}

virtual_server 91.199.167.39 143 {
delay_loop 6
lb_algo rr
# lb_kind NAT
lb_kind DR
# nat_mask 255.255.255.0
protocol TCP

# real_server 10.125.0.200 143 {
real_server 91.199.167.36 143 {
}
}

virtual_server 91.199.167.39 993 {
delay_loop 6
lb_algo rr
# lb_kind NAT
lb_kind DR
# nat_mask 255.255.255.0
protocol TCP
# real_server 10.125.0.200 993 {
real_server 91.199.167.36 993 {
weight 100
}
}

virtual_server 91.199.167.39 995 {
delay_loop 6
lb_algo rr
# lb_kind NAT
lb_kind DR
# nat_mask 255.255.255.0
protocol TCP

# real_server 10.125.0.200 995 {
real_server 91.199.167.36 995 {
weight 100
}
}

virtual_server 91.199.167.39 2222 {
delay_loop 6
lb_algo rr
# lb_kind NAT
lb_kind DR
# nat_mask 255.255.255.0
protocol TCP
# real_server 10.125.0.200 2222 {
real_server 91.199.167.36 2222 {
weight 100
}
}

virtual_server 213.189.17.39 21 {
delay_loop 6
lb_algo rr
# lb_kind NAT
lb_kind DR
# nat_mask 255.255.255.0
protocol TCP

# real_server 10.125.0.200 21 {
real_server 91.199.167.36 21 {
weight 100
}
}

virtual_server 213.189.17.39 25 {
delay_loop 6
lb_algo rr
# lb_kind NAT
# nat_mask 255.255.255.0
protocol TCP

# real_server 10.125.0.200 25 {
real_server 91.199.167.36 25 {
weight 100
}
}

virtual_server 213.189.17.39 587 {
delay_loop 6
lb_algo rr
# lb_kind NAT
lb_kind DR
# nat_mask 255.255.255.0
protocol TCP

# real_server 10.125.0.200 25 {
real_server 91.199.167.36 25 {
weight 100
}
}

virtual_server 213.189.17.39 10587 {
delay_loop 6
lb_algo rr
# lb_kind NAT
lb_kind DR
# nat_mask 255.255.255.0
protocol TCP

# real_server 10.125.0.200 25 {
real_server 91.199.167.36 25 {
weight 100
}
}

virtual_server 213.189.17.39 110 {
delay_loop 6
lb_algo rr
# lb_kind NAT
lb_kind DR
# nat_mask 255.255.255.0
protocol TCP

# real_server 10.125.0.200 110 {
real_server 91.199.167.36 110 {
weight 100
}
}

virtual_server 213.189.17.39 143 {
delay_loop 6
lb_algo rr
# lb_kind NAT
lb_kind DR
# nat_mask 255.255.255.0
protocol TCP

# real_server 10.125.0.200 143 {
real_server 91.199.167.36 143 {
}
}

virtual_server 213.189.17.39 993 {
delay_loop 6
lb_algo rr
# lb_kind NAT
lb_kind DR
# nat_mask 255.255.255.0
protocol TCP
# real_server 10.125.0.200 993 {
real_server 91.199.167.36 993 {
weight 100
}
}

virtual_server 213.189.17.39 995 {
delay_loop 6
lb_algo rr
# lb_kind NAT
lb_kind DR
# nat_mask 255.255.255.0
protocol TCP

# real_server 10.125.0.200 995 {
real_server 91.199.167.36 995 {
weight 100
}
}

virtual_server 213.189.17.39 2222 {
delay_loop 6
lb_algo rr
# lb_kind NAT
lb_kind DR
# nat_mask 255.255.255.0
protocol TCP
# real_server 10.125.0.200 2222 {
real_server 91.199.167.36 2222 {
weight 100
}
}

You can see an IPv6 address in the file, I will also look into it to make
everything also work on IPv6 soon.

Kind regards,

Mark Scholten


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