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Server Administration
Squid. The definitive guide
Preface
About This Book
Recommended Reading
Conventions Used in This Book
Comments and Questions
Acknowledgments
Chapter 1. Introduction
1.1 Web Caching
1.2 A Brief History of Squid
1.3 Hardware and Operating System Requirements
1.4 Squid Is Open Source
1.5 Squid's Home on the Web
1.6 Getting Help
1.7 Getting Started with Squid
1.8 Exercises
Chapter 2. Getting Squid
2.1 Versions and Releases
2.2 Use the Source, Luke
2.3 Precompiled Binaries
2.4 Anonymous CVS
2.5 devel.squid-cache.org
2.6 Exercises
Chapter 3. Compiling and Installing
3.1 Before You Start
3.2 Unpacking the Source
3.3 Pretuning Your Kernel
3.4 The configure Script
3.5 make
3.6 make Install
3.7 Applying a Patch
3.8 Running configure Later
3.9 Exercises
Chapter 4. Configuration Guide for the Eager
4.1 The squid.conf Syntax
4.2 User IDs
4.3 Port Numbers
4.4 Log File Pathnames
4.5 Access Controls
4.6 Visible Hostname
4.7 Administrative Contact Information
4.8 Next Steps
4.9 Exercises
Chapter 5. Running Squid
5.1 Squid Command-Line Options
5.2 Check Your Configuration File for Errors
5.3 Initializing Cache Directories
5.4 Testing Squid in a Terminal Window
5.5 Running Squid as a Daemon Process
5.6 Boot Scripts
5.7 A chroot Environment
5.8 Stopping Squid
5.9 Reconfiguring a Running Squid Process
5.10 Rotating the Log Files
5.11 Exercises
Chapter 6. All About Access Controls
6.1 Access Control Elements
6.2 Access Control Rules
6.3 Common Scenarios
6.4 Testing Access Controls
6.5 Exercises
Chapter 7. Disk Cache Basics
7.1 The cache_dir Directive
7.2 Disk Space Watermarks
7.3 Object Size Limits
7.4 Allocating Objects to Cache Directories
7.5 Replacement Policies
7.6 Removing Cached Objects
7.7 refresh_pattern
7.8 Exercises
Chapter 8. Advanced Disk Cache Topics
8.1 Do I Have a Disk I/O Bottleneck?
8.2 Filesystem Tuning Options
8.3 Alternative Filesystems
8.4 The aufs Storage Scheme
8.5 The diskd Storage Scheme
8.6 The coss Storage Scheme
8.7 The null Storage Scheme
8.8 Which Is Best for Me?
8.9 Exercises
Chapter 9. Interception Caching
9.1 How It Works
9.2 Why (Not) Intercept?
9.3 The Network Device
9.4 Operating System Tweaks
9.5 Configure Squid
9.6 Debugging Problems
9.7 Exercises
Chapter 10. Talking to Other Squids
10.1 Some Terminology
10.2 Why (Not) Use a Hierarchy?
10.3 Telling Squid About Your Neighbors
10.4 Restricting Requests to Neighbors
10.5 The Network Measurement Database
10.6 Internet Cache Protocol
10.7 Cache Digests
10.8 Hypertext Caching Protocol
10.9 Cache Array Routing Protocol
10.10 Putting It All Together
10.11 How Do I ...
10.12 Exercises
Chapter 11. Redirectors
11.1 The Redirector Interface
11.2 Some Sample Redirectors
11.3 The Redirector Pool
11.4 Configuring Squid
11.5 Popular Redirectors
11.6 Exercises
Chapter 12. Authentication Helpers
12.1 Configuring Squid
12.2 HTTP Basic Authentication
12.3 HTTP Digest Authentication
12.4 Microsoft NTLM Authentication
12.5 External ACLs
12.6 Exercises
Chapter 13. Log Files
13.1 cache.log
13.2 access.log
13.3 store.log
13.4 referer.log
13.5 useragent.log
13.6 swap.state
13.7 Rotating the Log Files
13.8 Privacy and Security
13.9 Exercises
Chapter 14. Monitoring Squid
14.1 cache.log Warnings
14.2 The Cache Manager
14.3 Using SNMP
14.4 Exercises
Chapter 15. Server Accelerator Mode
15.1 Overview
15.2 Configuring Squid
15.3 Gee, That Was Confusing!
15.4 Access Controls
15.5 Content Negotiation
15.6 Gotchas
15.7 Exercises
Chapter 16. Debugging and Troubleshooting
16.1 Some Common Problems
16.2 Debugging via cache.log
16.3 Core Dumps, Assertions, and Stack Traces
16.4 Replicating Problems
16.5 Reporting a Bug
16.6 Exercises
Appendix A. Config File Reference
http_port
https_port
ssl_unclean_shutdown
icp_port
htcp_port
mcast_groups
udp_incoming_address
udp_outgoing_address
cache_peer
cache_peer_domain
neighbor_type_domain
icp_query_timeout
maximum_icp_query_timeout
mcast_icp_query_timeout
dead_peer_timeout
hierarchy_stoplist
no_cache
cache_access_log
cache_log
cache_store_log
cache_swap_log
emulate_httpd_log
log_ip_on_direct
cache_dir
cache_mem
cache_swap_low
cache_swap_high
maximum_object_size
minimum_object_size
maximum_object_size_in_memory
cache_replacement_policy
memory_replacement_policy
store_dir_select_algorithm
mime_table
ipcache_size
ipcache_low
ipcache_high
fqdncache_size
log_mime_hdrs
useragent_log
referer_log
pid_filename
debug_options
log_fqdn
client_netmask
ftp_user
ftp_list_width
ftp_passive
ftp_sanitycheck
cache_dns_program
dns_children
dns_retransmit_interval
dns_timeout
dns_defnames
dns_nameservers
hosts_file
diskd_program
unlinkd_program
pinger_program
redirect_program
redirect_children
redirect_rewrites_host_header
redirector_access
redirector_bypass
auth_param
authenticate_ttl
authenticate_cache_garbage_interval
authenticate_ip_ttl
external_acl_type
wais_relay_host
wais_relay_port
request_header_max_size
request_body_max_size
refresh_pattern
quick_abort_min
quick_abort_max
quick_abort_pct
negative_ttl
positive_dns_ttl
negative_dns_ttl
range_offset_limit
connect_timeout
peer_connect_timeout
read_timeout
request_timeout
persistent_request_timeout
client_lifetime
half_closed_clients
pconn_timeout
ident_timeout
shutdown_lifetime
acl
http_access
http_reply_access
icp_access
miss_access
cache_peer_access
ident_lookup_access
tcp_outgoing_tos
tcp_outgoing_address
reply_body_max_size
cache_mgr
cache_effective_user
cache_effective_group
visible_hostname
unique_hostname
hostname_aliases
announce_period
announce_host
announce_file
announce_port
httpd_accel_host
httpd_accel_port
httpd_accel_single_host
httpd_accel_with_proxy
httpd_accel_uses_host_header
dns_testnames
logfile_rotate
append_domain
tcp_recv_bufsize
err_html_text
deny_info
memory_pools
memory_pools_limit
forwarded_for
log_icp_queries
icp_hit_stale
minimum_direct_hops
minimum_direct_rtt
cachemgr_passwd
store_avg_object_size
store_objects_per_bucket
client_db
netdb_low
netdb_high
netdb_ping_period
query_icmp
test_reachability
buffered_logs
reload_into_ims
always_direct
never_direct
header_access
header_replace
icon_directory
error_directory
maximum_single_addr_tries
snmp_port
snmp_access
snmp_incoming_address
snmp_outgoing_address
as_whois_server
wccp_router
wccp_version
wccp_incoming_address
wccp_outgoing_address
delay_pools
delay_class
delay_access
delay_parameters
delay_initial_bucket_level
incoming_icp_average
incoming_http_average
incoming_dns_average
min_icp_poll_cnt
min_dns_poll_cnt
min_http_poll_cnt
max_open_disk_fds
offline_mode
uri_whitespace
broken_posts
mcast_miss_addr
mcast_miss_ttl
mcast_miss_port
mcast_miss_encode_key
nonhierarchical_direct
prefer_direct
strip_query_terms
coredump_dir
ignore_unknown_nameservers
digest_generation
digest_bits_per_entry
digest_rebuild_period
digest_rewrite_period
digest_swapout_chunk_size
digest_rebuild_chunk_percentage
chroot
client_persistent_connections
server_persistent_connections
pipeline_prefetch
extension_methods
request_entities
high_response_time_warning
high_page_fault_warning
high_memory_warning
ie_refresh
vary_ignore_expire
sleep_after_fork
Appendix B. The Memory Cache
Appendix C. Delay Pools
C.1 Overview
C.2 Configuring Squid
C.3 Examples
C.4 Issues
C.5 Monitoring Delay Pools
Appendix D. Filesystem Performance Benchmarks
D.1 The Benchmark Environment
D.2 General Comments
D.3 Linux
D.4 FreeBSD
D.5 OpenBSD
D.6 NetBSD
D.7 Solaris
D.8 Number of Disk Spindles
Appendix E. Squid on Windows
E.1 Cygwin
E.2 SquidNT
Appendix F. Configuring Squid Clients
F.1 Manually
F.2 Proxy Auto-Configuration
F.3 WPAD
F.4 Summary
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