Varnish Cache 運用編 ref: http://qiita.com/satoruk/items/37fc2824c932fc4ad94a

cache_backend.h

struct backend {
    unsigned        magic;
#define BACKEND_MAGIC       0x64c4c7c6

    VTAILQ_ENTRY(backend)   list;
    int         refcount;
    struct lock     mtx;

cache_backend_cfg.c

static int __match_proto__()
do_list(struct cli *cli, struct backend *b, void *priv)
{
    /* 省略 */

    VCLI_Out(cli, "\n%-30s %-6d", b->display_name, b->refcount);

file0.txt

# varnishadm -S /etc/varnish/secret -T 127.0.0.1:6082 "ban.url .*"
# echo $?
0

file1.txt

# varnishadm backend.list
Backend name               Refs   Admin      Probe
web_01(192.168.0.11,,8080) 1      probe      Healthy 3/3
web_02(192.168.0.12,,8080) 1      probe      Healthy 3/3

file2.txt

# varnishadm backend.set_health web_01 sick
# varnishadm backend.list

Backend name               Refs   Admin      Probe
web_01(192.168.0.11,,8080) 1      sick       Healthy 3/3
web_02(192.168.0.12,,8080) 1      probe      Healthy 3/3

file3.txt

   14 BackendClose - default
   14 BackendOpen  b default 192.168.0.110 37567 192.168.0.111 8080
   14 TxRequest    b HEAD
   14 TxURL        b /robots.txt
   14 TxProtocol   b HTTP/1.1
   14 TxHeader     b Authorization: Basic aG9iZWhvZ2U6aG9nZWhvZ2U=
   14 TxHeader     b User-Agent: curl/7.24.0 (x86_64-apple-darwin12.0) libcurl/7.24.0 OpenSSL/0.9.8y zlib/1.2.5
   14 TxHeader     b Host: hogehoge.jp
   14 TxHeader     b Accept: */*
   14 TxHeader     b X-Forwarded-For: 192.168.0.101
   14 TxHeader     b X-Varnish: 301929229
   14 RxProtocol   b HTTP/1.1
   14 RxStatus     b 404
   14 RxResponse   b Not Found
   14 RxHeader     b Server: Apache-Coyote/1.1
   14 RxHeader     b Content-Length: 0
   14 RxHeader     b Date: Thu, 30 Jan 2014 10:12:26 GMT
   14 Fetch_Body   b 0(none) cls 0 mklen 0
   14 Length       b 0
   14 BackendReuse b default

file5.txt

   14 BackendClose - default
   14 BackendOpen  b default 192.168.0.110 37567 192.168.0.111 8080
   14 TxRequest    b HEAD
   14 TxURL        b /robots.txt
   14 TxProtocol   b HTTP/1.1
   14 TxHeader     b Authorization: Basic aG9iZWhvZ2U6aG9nZWhvZ2U=
   14 TxHeader     b User-Agent: curl/7.24.0 (x86_64-apple-darwin12.0) libcurl/7.24.0 OpenSSL/0.9.8y zlib/1.2.5
   14 TxHeader     b Host: hogehoge.jp
   14 TxHeader     b Accept: */*
   14 TxHeader     b X-Forwarded-For: 192.168.0.101
   14 TxHeader     b X-Varnish: 301929229
   14 RxProtocol   b HTTP/1.1
   14 RxStatus     b 404
   14 RxResponse   b Not Found
   14 RxHeader     b Server: Apache-Coyote/1.1
   14 RxHeader     b Content-Length: 0
   14 RxHeader     b Date: Thu, 30 Jan 2014 10:12:26 GMT
   14 Fetch_Body   b 0(none) cls 0 mklen 0
   14 Length       b 0
   14 BackendReuse b default