Use Multi-IP Address To Sent Out Request At The Same Time

Aug 20, 2008

Is this possible to use Multi-IP to sent out request at the same time?

Scenario
-8 IP is assigned to my box
-I have 8 domains

Now, I would like to connect to a serverX, However, serverX only allow two concurrent connection per IP at the same time.

Is this possible for me to use 8 IPs with 8 Domains to sent out request and having (2X8) = 16 concurrent connection to serverX

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Apache :: How To Use Virtual Host IP Address In Request To Remote Address

Feb 6, 2015

My customer has an external facing Apache server that is acting as a reverse proxy to two internal applications. They have:

- external addresses for each app which resolve to different ip addresses, so app1.their_domain.com and app2.their_domain.com resolve to 77.3.170.10 and 77.3.170.11 respectively.
- the Apache server has two network interfaces with ip addresses 192.168.10.10 and 192.168.10.11
- the external ip addresses resolve to the above internal addresses
- the firewall between the Apache server and the internal app servers is configured to allow traffic from 192.168.10.10 to reach app_server1, and traffic from 192.168.10.11 to reach app_server2, both using port 7777.

I have configured a virtual host in httpd.conf for each ip, i.e.

Code:

<VirtualHost 192.168.10.10:80>
...
ProxyPass /app http://app_server1:7777/app
ProxyPassReverse /app http://app_server1:7777/app
RewriteRule ^/$ /app/app1 [R,L]
...
<VirtualHost>

and

Code:

<VirtualHost 192.168.10.11:80>
...
ProxyPass /app http://app_server2:7777/app
ProxyPassReverse /app http://app_server2:7777/app
RewriteRule ^/$ /app/app2 [R,L]
...
<VirtualHost>

This works fine in that the external address are being routed to the correct application, however the firewall is blocking requests to the second app as it appears the requests are coming from the Apache servers 'primary' ip address 192.168.10.10 instead of 192.168.10.11.

Is it possible to send requests using the ip address from the relevant VirtualHost?

Windows server 2008
Apache 2.2

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Request response time on my openvz node is very very low!

Load is below than 4 6 5

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Jan 16, 2007

At 1:25am last night I received this message and our server locked up:

Jan 16 01:25:02 host kernel: Unable to handle kernel paging request at virtual address 00361fa8
Jan 16 01:25:02 host kernel: printing eip:
Jan 16 01:25:02 host kernel: c0177f86
Jan 16 01:25:02 host kernel: *pde = 3cc79067
Jan 16 01:25:02 host kernel: Oops: 0000 [#1]
Jan 16 01:25:02 host kernel: Modules linked in: md5 ipv6 parport_pc lp parport ipt_TOS ip_conntrack_ftp ip_conntrack_irc ipt_REJECT ipt_limit ipt_multiport ipt_state autofs4 sunrpc ipt_LOG iptable_filter iptable_mangle iptable_nat ip_conntrack ip_tables dm_mirror dm_mod button battery ac ohci_hcd ehci_hcd r8169 8139too mii floppy ext3 jbd
Jan 16 01:25:02 host kernel: CPU: 0
Jan 16 01:25:02 host kernel: EIP: 0060:[<c0177f86>] Not tainted VLI
Jan 16 01:25:02 host kernel: EFLAGS: 00010202 (2.6.9-22.EL)
Jan 16 01:25:02 host kernel: EIP is at __link_path_walk+0xa77/0xd98
Jan 16 01:25:02 host kernel: eax: 00361f80 ebx: 00000000 ecx: f3138e60 edx: f3138e5c
Jan 16 01:25:02 host kernel: esi: f7b4ea0c edi: 01b07b37 ebp: f3138f0c esp: f3138e3c
Jan 16 01:25:03 host crond(pam_unix)[27321]: session closed for user root
Jan 16 01:25:03 host kernel: ds: 007b es: 007b ss: 0068
Jan 16 01:25:03 host kernel: Process dataskq (pid: 27325, threadinfo=f3138000 task=f403d220)
Jan 16 01:25:03 host kernel: Stack: f3138f58 00000000 f3138e90 c018109b 00000001 00000000 f4e0f00a c18c8c80
Jan 16 01:25:03 host kernel: f22e0ef8 01b07b37 00000004 f4e0f006 f3138f0c f3138f0c f4e0f000 f4e0f000
Jan 16 01:25:03 host kernel: 00000000 c01782e8 f7c609b8 c18c8e00 00000000 00000000 00000000 00000001
Jan 16 01:25:03 host kernel: Call Trace:
Jan 16 01:25:03 host kernel: [<c018109b>] dput+0x33/0x423
Jan 16 01:25:03 host kernel: [<c01782e8>] link_path_walk+0x41/0xb9
Jan 16 01:25:03 host kernel: [<c01785e0>] path_lookup+0x104/0x135
Jan 16 01:25:03 host kernel: [<c0178725>] __user_walk+0x21/0x51
Jan 16 01:25:03 host kernel: [<c01729bc>] vfs_stat+0x14/0x3a
Jan 16 01:25:03 host kernel: [<c0172fc5>] sys_stat64+0xf/0x23
Jan 16 01:25:03 host kernel: [<c030f91f>] syscall_call+0x7/0xb
Jan 16 01:25:03 host kernel: Code: e8 46 f4 ff ff 8b 44 24 20 8b 70 20 31 c0 85 f6 0f 95 c0 85 44 24 10 0f 84 6f 02 00 00 8b 86 cc 00 00 00 85 c0 0f 84 61 02 00 00 <83> 78 28 00 0f 84 57 02 00 00 8b 44 24 1c 85 c0 74 03 ff 40 28
Jan 16 01:25:03 host kernel: <0>Fatal exception: panic in 5 seconds
Jan 16 01:25:06 host crond(pam_unix)[27320]: session closed for user root

-----------------------------------------------
Yesterday morning I received a similare message aswell as the server locking up:
------------------------------------------------

Jan 15 06:40:47 host kernel: Unable to handle kernel paging request at virtual address 00fe0dc8
Jan 15 06:40:47 host kernel: printing eip:
Jan 15 06:40:47 host kernel: c03074f2
Jan 15 06:40:47 host kernel: *pde = 3b25c067
Jan 15 06:40:47 host kernel: Oops: 0002 [#1]
Jan 15 06:40:47 host kernel: Modules linked in: md5 ipv6 parport_pc lp parport ipt_TOS ip_conntrack_ftp ip_conntrack_irc ipt_REJECT ipt_limit ipt_multiport ipt_state autofs4 sunrpc ipt_LOG iptable_filter iptable_mangle iptable_nat ip_conntrack ip_tables dm_mirror dm_mod button battery ac ohci_hcd ehci_hcd r8169 8139too mii floppy ext3 jbd
Jan 15 06:40:47 host kernel: CPU: 0
Jan 15 06:40:47 host kernel: EIP: 0060:[<c03074f2>] Not tainted VLI
Jan 15 06:40:47 host kernel: EFLAGS: 00010286 (2.6.9-22.EL)
Jan 15 06:40:47 host kernel: EIP is at __unix_remove_socket+0x14/0x4e
Jan 15 06:40:47 host kernel: eax: f7abb948 ebx: f5fe0280 ecx: f5fe0288 edx: 00fe0dc8
Jan 15 06:40:47 host kernel: esi: f5fe0280 edi: f76fccbc ebp: 00000000 esp: f6974f68
Jan 15 06:40:47 host kernel: ds: 007b es: 007b ss: 0068
Jan 15 06:40:47 host kernel: Process estate.cgi (pid: 10298, threadinfo=f6974000 task=f6870600)
Jan 15 06:40:47 host kernel: Stack: 00000000 c030775f f5fe0280 f5fe0280 00000000 f76fcc80 f76fccbc f7a7a780
Jan 15 06:40:47 host kernel: c02aae3a f76fccbc c18c8600 c02ab950 f65b4680 c0168e5a f65b4680 00000000
Jan 15 06:40:47 host kernel: f792ac80 f6974000 c0167763 00000003 09d6cec8 00000000 c030f91f 00000003
Jan 15 06:40:47 host kernel: Call Trace:
Jan 15 06:40:47 host kernel: [<c030775f>] unix_release_sock+0xf/0x19f
Jan 15 06:40:47 host kernel: [<c02aae3a>] sock_release+0x11/0x63
Jan 15 06:40:47 host kernel: [<c02ab950>] sock_close+0x26/0x2a
Jan 15 06:40:47 host kernel: [<c0168e5a>] __fput+0x55/0xee
Jan 15 06:40:47 host kernel: [<c0167763>] filp_close+0x59/0x5f
Jan 15 06:40:47 host kernel: [<c030f91f>] syscall_call+0x7/0xb
Jan 15 06:40:47 host kernel: Code: 89 c2 c1 ea 08 31 c2 81 e2 ff 00 00 00 89 16 89 fa 5b 89 d0 5e 5f c3 53 89 c3 83 78 0c 00 74 43 8d 48 08 8b 40 08 8b 51 04 85 c0 <89> 02 74 03 89 50 04 c7 41 04 00 00 00 00 8b 43 18 48 75 21 68
Jan 15 06:40:47 host kernel: <0>Fatal exception: panic in 5 seconds

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