[squid-users] Re: squid 3.2.0.14 with TPROXY => commBind: Cannot bind socket FD 773 to xxx.xxx.xxx.xx: (98) Address

Hi Amos,

I have exactly the same issue as the above described.

Running squid 3.3.8 in TPROXY mode.

In my setup the squid is serving around 10000 online subscribers, and this
problem happens when i put the whole HTTP traffic. If I'm redirecting only
half of the users - then it works fine.

I guess it's something related to LIMITS imposed by the OS or the Squid
itself. Please help to identify the exact bottleneck if this issue, because
this is scalability issue.

squidclient mgr:info |grep HTTP
HTTP/1.1 200 OK
        Number of HTTP requests received: 1454792
        Average HTTP requests per minute since start: 116719.5

squidclient mgr:info |grep file
        Maximum number of file descriptors: 524288
        Largest file desc currently in use: 132904
        Number of file desc currently in use: 80893
        Available number of file descriptors: 443395
        Reserved number of file descriptors: 800
        Store Disk files open: 0

ulimit -a from the OS

core file size (blocks, -c) unlimited
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 386229
max locked memory (kbytes, -l) 64
max memory size (kbytes, -m) unlimited
open files (-n) 1000000
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 8192
cpu time (seconds, -t) unlimited
max user processes (-u) 386229
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited

Some tunings applied also, but not helping much:

echo "applying specific tunings"
echo 500 65535 > /proc/sys/net/ipv4/ip_local_port_range
echo 65000 > /proc/sys/net/ipv4/tcp_max_syn_backlog
echo 600 > /proc/sys/net/ipv4/tcp_keepalive_time
echo 50000 > /proc/sys/net/core/netdev_max_backlog

echo 15 > /proc/sys/net/ipv4/tcp_keepalive_intvl
echo 5 > /proc/sys/net/ipv4/tcp_keepalive_probes
echo 1 > /proc/sys/net/ipv4/tcp_tw_reuse # it's ok
echo 1 > /proc/sys/net/ipv4/tcp_tw_recycle # it's ok
echo 2000000 > /proc/sys/net/ipv4/tcp_max_tw_buckets #default 262144 on
Ubuntu

Let me know what other info might be useful for you?

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