What s new in Apache HTTP Server 2.2. Jim Jagielski jim@jagunet.com
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1 What s new in Apache HTTP Server 2.2 Jim Jagielski jim@jagunet.com
2 About me Longtime active contributor (July/Aug 1995) ASF Co-founder Other ASF titles as well CTO of Covalent Technologies Husband, father, all around nice guy 2
3 How did we get here? A short history of Apache HTTP Server (at least regarding 2.2) Apache released in June 1998 Apache 2.0a1 released in March 2000 (at ApacheCon!) First GA version of Apache 2.0 released on April 2002: Apache Apache released on Dec We are now at (2.2.7 soonish) 3
4 Apache 2.0 Apache 2.0 was designed to address shortcomings in 1.3 MPM Module ordering dependencies Hooks Filters Protocol modules Sub-module concept APR IPV6 4
5 So Apache 2.0 was... Basically a rewrite of Apache 1.3 An opportunity to rethink how Apache works An opportunity to make setup and config more elegant de-merge proxy and cache better authen. and authorz 5
6 Did we succeed? To a great extent yes But some things lagged behind Or didn t quite turn out the way we hoped 6
7 Why 2.2? Despite advances in 2.0.x tree, improvements needed to be made But those improvements would break the API Plus, many of them required later versions of APR 7
8 Apache 2.2 Goals Bring all functionality up to parity Be an evolutionary step from 2.0 Incremental, logical steps 2.0 modules require (for the most part) just a simple recompilation Keep what 2.0 did right, and improve on remaining features 8
9 So what s new in 2.2? 9
10 So what s new in 2.2? Nothing 9
11 So what s new in 2.2? Nothing Thanks! 9
12 So what s new in 2.2? Nothing Thanks! Be sure to tip your waiters! 9
13 No, really... Large file support Graceful stop mod_dbd mod_filter Better Debugging and info Caching Event MPM Authn/Authz Proxy 10
14 Large file support 2GB is no longer a stupid limit Much better 64 bit awareness And much better behavior on 32 bit systems Thanks to APR 11
15 Graceful stop We all know about graceful restart Now Apache will also gracefully stop when shutting down, Apache will let existing requests finish But what about really, really long or nasty requests? GracefulShutdownTime # == number of seconds grace time 0 == forever 12
16 Graceful start We have: graceful restart graceful shutdown How about a graceful start? 13
17 Ha ha Very funny 14
18 mod_dbd The problem Lots of modules using lots of SQL connections EG: authn/authz, logging, PHP... Even worse with threaded MPMs mod_dbd manages all that for you ap_dbd_open, ap_dbd_prepare,... Connection pooling comes to the party 15
19 mod_filter The problem: filters are basically inserted unconditionally Blunt tool approach - bad w/ dynamic content Admins want more flexibility The solution: A dynamic chaining of filters Filters inserted based on req headers, resp headers and env-vars. 16
20 Better Debugging mod_dumpio Dumps all IO to the error log Yep, all of it DumpIOInput On DumpIOOutput On DumpIOLogLevel Notice What about SSL? Dumping is done right after decryption or right before encrypting 17
21 mod_dumpio mod_dumpio: dumpio_in [getline-blocking] 0 readbytes mod_dumpio: dumpio_in (data-heap): 16 bytes mod_dumpio: dumpio_in (data-heap): GET / HTTP/1.1\r\n mod_dumpio: dumpio_in [getline-blocking] 0 readbytes mod_dumpio: dumpio_in (data-heap): 13 bytes mod_dumpio: dumpio_in (data-heap): Accept: */*\r\n mod_dumpio: dumpio_out mod_dumpio: dumpio_out (data-heap): 291 bytes mod_dumpio: dumpio_out (data-heap): HTTP/ OK\r\nDate: Thu, 12 Oct :35:52 GMT\r\nServer: Apache/2.2.4-dev (Unix) DAV/2\r\nLast-Modified: Fri, 10 Dec :17:55 GMT\r\nETag: "7b3e83-2c-9eedeac0"\r\nAccept-Ranges: bytes\r\ncontent-length: 44\r\nKeep-Alive: timeout=5, max=98\r\n Connection: Keep-Alive\r\nContent-Type: text/html\r\n\r\n mod_dumpio: dumpio_out mod_dumpio: dumpio_out (data-file): 44 bytes mod_dumpio: dumpio_out (data-mmap): <html><body><h1>it works!</ h1></body></html> mod_dumpio: dumpio_out (metadata-eos): 0 bytes 18
22 Better Debugging mod_log_forensic forensic logging of each request Each request results in 2 log lines Initial request with unique ID +yqtjf8ab4aafnxqy GET /manual/... Response done tag -yqtjf8ab4aafnxqy track and trace requests 19
23 Better debugging mod_info:?config : Just the configuration directives, not sorted by module?hooks : Only the list of Hooks each module is attached to?list : Only a simple list of enabled modules?server : Only the basic server information 20
24 mod_info screensnap 21
25 mod_info screensnap 22
26 Caching Dirty little 2.0 secret When we separated mod_proxy and mod_cache, mod_cache didn t get a lot of TLC Code was not clean Nasty performance disk cache lacked good maintenance Lacked RFC compliance 23
27 Apache 2.2 Caching No longer experimental! Caching stores copies of static or dynamic content (if possible) for quick access mod_cache: The caching framework mod_disk_cache / mod_mem_cache Determines cache implementation 24
28 Caching modules mod_disk_cache Stores cached material on file system Key based access mod_mem_cache Stores cached material in shared memory cache. Caches open file descriptors. Caches content object. 25
29 disk vs. mem Lots of work done on both mem fast because it uses shared memory locking restarts make cache go bye bye disk long term storage zero-copy transfer 26
30 Simple Config Just cache CSS files LoadModule cache_module modules/mod_cache.so LoadModule mem_cache_module modules/mod_mem_cache.so CacheEnable mem /css MCacheSize 1024 MCacheMaxObjectCount 100 MCacheMinObjectSize 1 MCacheMaxObjectSize
31 htcacheclean mod_disk_cache places no limits on disk usage htcacheclean cleans up and limits utilization run manually or in daemon mode htcacheclean -p/var/db/httpd/cache \ -l250m -d30 28
32 Event MPM Still considered experimental Seeing some extensive use The problem: Those nasty keepalives The worker thread is stuck waiting for the next persistent request The solution: Pop that waiting connection back into the listener thread s domain 29
33 An illustration to help Actual workers Listener Sockets of interest Storage of Ready sockets 30
34 An illustration to help Actual workers Listener Sockets of interest Storage of Ready sockets 30
35 An illustration to help Actual workers Listener Sockets of interest Storage of Ready sockets 30
36 An illustration to help Actual workers Listener Sockets of interest Storage of Ready sockets 30
37 An illustration to help Actual workers Listener Sockets of interest Storage of Ready sockets 30
38 An illustration to help Actual workers Keepalive connection Listener Sockets of interest Storage of Ready sockets 30
39 An illustration to help Actual workers Keepalive connection Listener Sockets of interest Storage of Ready sockets 30
40 Authn / Authz Authorization Permit access to a resource based on who/what/where/why/when Authentication Determine who/what/where/why/when Two different concepts 2.2 divides them. 31
41 Two implementations mod_auth_basic Speaks PLAIN TEXT user and password over the wire not secure mod_auth_digest Speaks a hash of the host digest domain, user and password, this is much more secure over http: connections! Most browser supports Digest today, many custom clients don t 32
42 Providers for info mod_authn_file the classic, a flat list of users and slows quickly as the list grows mod_authn_dbm the classic, faster solution, plug into Berkeley DB, GDBM, SDBM etc mod_authn_dbd the newest solution, use an Oracle / MySQL table for your user store 33
43 Providers for info mod_authn_anon the Anonymous backstop, no password validation mod_authn_default the absolute backstop (not-authenticated result) mod_authn_alias Group the many directives of a provider into an <AuthnProviderAlias > block. 34
44 Authz mod_authz_user Grant/restrict access based on Authenticated user mod_authz_groupfile Store group -> users associations in a flat file mod_authz_dbm Store user group in a Berkley DB / GDBM flat database 35
45 Authz mod_authz_owner Access files by OWNER, either user or group mod_authz_host What you knew as access, restrict by the client s IP/hostname mod_authz_default the backstop when no authorization is matched. 36
46 Authn / Authz mod_authnz_ldap Both authn user and authz group principals apply at once to users authorized against an LDAP data store. Basically, it does both 37
47 Simple example AuthType Basic AuthName "Restricted Files" AuthUserFile /path-to/htpasswd AuthBasicProvider file Require user jim 38
48 Not so simple <AuthnProviderAlias ldap ldap-alias1> AuthLDAPBindDN cn=youruser,o=ctx AuthLDAPBindPassword yourpassword AuthLDAPURL ldap://ldap.host/o=ctx </AuthnProviderAlias> Alias /secure /webpages/secure <Directory /webpages/secure> Order deny,allow Allow from all AuthBasicProvider ldap-alias1 AuthType Basic AuthName LDAP_Protected_Place AuthzLDAPAuthoritative off require valid-user </Directory> 39
49 Interested in more 2.2 auth? Attend Brad Nicholes session Friday, 4pm 40
50 Interested in more 2.2 auth? Attend Brad Nicholes session Friday, 4pm 40
51 Proxy Becoming a robust but generic proxy implementation Supports various protocols HTTP, HTTPS, CONNECT, FTP AJP, FastCGI (coming soonish ) Load balancing Clustering, failover 41
52 mod_proxy_ajp Apache can now talk AJP with Tomcat directly Other proxy improvements make this even more exciting mod_jk alternative 42
53 Load Balancer mod_proxy can do native load balancing weight by actual requests weight by traffic LB algo s are impl as providers easy to add no core code changes required 43
54 Load Balancer Backend connection pooling Sticky session support Cluster set with failover Lump backend servers as sets balancer will try lower-valued sets first Hot standby Configurable in real-time 44
55 Example <Proxy balancer://foo> BalancerMember loadfactor=1 BalancerMember loadfactor=4 BalancerMember loadfactor=4 status=+h ProxySet lbmethod=bytraffic </Proxy> <Proxy balancer://javaapps> BalancerMember ajp://tc1:8089/ loadfactor=1 BalancerMember ajp://tc2:8089/ loadfactor=4 ProxySet lbmethod=byrequests </Proxy> ProxyPass /apps/ balancer://foo/ ProxyPass /serv/ balancer://javaapps/ ProxyPass /images/ 45
56 Admin 46
57 Oh yeah ProxyPassMatch ProxyPassMatch ^(/.*\.gif)$ \ 47
58 Want more 2.2 proxy info? Attend Jim Jagielski s session Friday, 3pm I hear he s pretty good... 48
59 What s on the horizon? Some additional potential backports mod_substitute FastCGI proxy module True async server support serf: Code name: Amsterdam tell us! 49
60 Thanks! Q&A Resources: A certain Open Source support provider 50
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