Hi Amos, 2013/2/15 Amos Jeffries <squid3@xxxxxxxxxxxxx>: > On 15/02/2013 10:43 p.m., dahanhsi wrote: >> >> Thanks for your reply, >> provide more information below: >> >> 2013/2/15 Amos Jeffries <squid3@xxxxxxxxxxxxx>: >>> >>> On 15/02/2013 10:12 p.m., dahanhsi wrote: >>>> >>>> Hi all, >>>> >>>> I use squid as a reverse proxy, and make thousands of connection to the >>>> it. >>> >>> Which version of Squid? >> >> I use Squid 2.7 > > > > Output of "squid -v" please. # squid -v Squid Cache: Version 2.7.STABLE9 configure options: '--prefix=/usr' '--exec_prefix=/usr' '--bindir=/usr/sbin' '--sbindir=/usr/sbin' '--libexecdir=/usr/lib/squid' '--sysconfdir=/etc/squid' '--localstatedir=/var/spool/squid' '--datadir=/usr/share/squid' '--enable-async-io' '--with-pthreads' '--enable-storeio=ufs,aufs,coss,diskd,null' '--enable-linux-netfilter' '--enable-arp-acl' '--enable-epoll' '--enable-removal-policies=lru,heap' '--enable-snmp' '--enable-delay-pools' '--enable-htcp' '--enable-cache-digests' '--enable-underscores' '--enable-referer-log' '--enable-useragent-log' '--enable-auth=basic,digest,ntlm,negotiate' '--enable-negotiate-auth-helpers=squid_kerb_auth' '--enable-carp' '--enable-follow-x-forwarded-for' '--with-large-files' '--with-maxfd=65536' 'amd64-debian-linux' 'build_alias=amd64-debian-linux' 'host_alias=amd64-debian-linux' 'target_alias=amd64-debian-linux' 'CFLAGS=-Wall -g -O2' 'LDFLAGS=-Wl,-Bsymbolic-functions' 'CPPFLAGS=' > > > >> >>> What do you mean by "thousands of connections". 1's of tousands? 10's of >>> thousands? 100's of thousands? >> >> # netstat -nat|grep -i "80"|wc -l >> the result vary from 4651 to 9404 >> >>> >>>> There are one ten of all connections can not establish in TCP layer, >>>> because squid does not respond SYN-ACK to client's SYN packet. How can >>>> I solve it? >>>> Thanks >>> >>> >>> Check ulimit settings for Squid? >>> >> # ulimit -a >> core file size (blocks, -c) 0 >> data seg size (kbytes, -d) unlimited >> scheduling priority (-e) 20 >> file size (blocks, -f) unlimited >> pending signals (-i) 16382 >> max locked memory (kbytes, -l) 64 >> max memory size (kbytes, -m) unlimited >> open files (-n) 655360 >> 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) unlimited >> virtual memory (kbytes, -v) unlimited >> file locks (-x) unlimited >> >>> Check your cache.log for messages about running out of filedescriptors? >> >> I set my limit.conf to: >> root soft nofile 655360 >> root hard nofile 655360 > > > That does not answer the question. Squid may have been built or configured > with a limit of less than 655360 filedescriptors. > cache.log should tell you if Squid is reaching some limit like this. my cache.log: 2013/02/15 8:30:10| Starting Squid Cache version 2.7.STABLE9 for x86_64-debian-linux-gnu... 2013/02/15 8:30:10| Process ID 8136 2013/02/15 8:30:10| With 2048 file descriptors available 2013/02/15 8:30:10| Using epoll for the IO loop 2013/02/15 8:30:10| DNS Socket created at 0.0.0.0, port 6450, FD 6 2013/02/15 8:30:10| Adding nameserver 8.8.8.8 from /etc/resolv.conf 2013/02/15 8:30:10| User-Agent logging is disabled. 2013/02/15 8:30:10| Referer logging is disabled. 2013/02/15 8:30:10| logfileOpen: opening log /var/log/squid/access.log 2013/02/15 8:30:10| Unlinkd pipe opened on FD 12 2013/02/15 8:30:10| Swap maxSize 8192 + 8388608 KB, estimated 645907 objects 2013/02/15 8:30:10| Target number of buckets: 32295 2013/02/15 8:30:10| Using 32768 Store buckets 2013/02/15 8:30:10| Max Mem size: 8388608 KB 2013/02/15 8:30:10| Max Swap size: 8192 KB 2013/02/15 8:30:10| Local cache digest enabled; rebuild/rewrite every 3600/3600 sec 2013/02/15 8:30:10| logfileOpen: opening log /var/log/squid/store.log 2013/02/15 8:30:10| Rebuilding storage in /var/spool/squid (CLEAN) 2013/02/15 8:30:10| Using Least Load store dir selection 2013/02/15 8:30:10| Set Current Directory to /var/spool/squid 2013/02/15 8:30:10| Loaded Icons. 2013/02/15 8:30:10| Accepting accelerated HTTP connections at 0.0.0.0, port 80, FD 14. 2013/02/15 8:30:10| Accepting ICP messages at 0.0.0.0, port 3130, FD 15. 2013/02/15 8:30:10| HTCP Disabled. 2013/02/15 8:30:10| WCCP Disabled. 2013/02/15 8:30:10| Configuring localhost Parent localhost/12080/0 2013/02/15 8:30:10| Ready to serve requests. 2013/02/15 8:30:10| Done reading /var/spool/squid swaplog (11 entries) 2013/02/15 8:30:10| Finished rebuilding storage from disk. 2013/02/15 8:30:10| 11 Entries scanned 2013/02/15 8:30:10| 0 Invalid entries. 2013/02/15 8:30:10| 0 With invalid flags. 2013/02/15 8:30:10| 11 Objects loaded. 2013/02/15 8:30:10| 0 Objects expired. 2013/02/15 8:30:10| 0 Objects cancelled. 2013/02/15 8:30:10| 0 Duplicate URLs purged. 2013/02/15 8:30:10| 0 Swapfile clashes avoided. 2013/02/15 8:30:10| Took 0.3 seconds ( 41.8 objects/sec). 2013/02/15 8:30:10| Beginning Validation Procedure 2013/02/15 8:30:10| Completed Validation Procedure 2013/02/15 8:30:10| Validated 11 Entries 2013/02/15 8:30:10| store_swap_size = 44k 2013/02/15 8:30:11| storeLateRelease: released 0 objects 2013/02/15 8:30:35| CACHEMGR: <unknown>@127.0.0.1 requesting 'info' 2013/02/15 8:30:39| CACHEMGR: <unknown>@127.0.0.1 requesting 'info' 2013/02/15 8:30:40| CACHEMGR: <unknown>@127.0.0.1 requesting 'info' 2013/02/15 8:30:42| CACHEMGR: <unknown>@127.0.0.1 requesting 'info' 2013/02/15 8:30:44| CACHEMGR: <unknown>@127.0.0.1 requesting 'info' 2013/02/15 8:33:10| CACHEMGR: <unknown>@127.0.0.1 requesting 'info' when connection timeout error occurred, I do not see error about file descriptor. my /etc/sysclt.conf net.ipv4.tcp_syncookies = 1 net.ipv4.tcp_tw_reuse = 1 net.ipv4.tcp_tw_recycle = 1 net.ipv4.tcp_fin_timeout = 30 fs.file-max = 65536 my squid.conf has: max_filedescriptors 2048 and my squidclient says: squidclient -p 80 mgr:info | grep "file desc" Maximum number of file descriptors: 2048 Available number of file descriptors: 1651 Reserved number of file descriptors: 100 > > Amos
