Ping\uff08\u8cc7\u6599\u5c01\u5305\u7db2\u969b\u7db2\u8def\u63a2\u6e2c\u5668\uff09\u57fa\u65bc\u7db2\u969b\u7db2\u8def\u63a7\u5236\u8a0a\u606f\u5354\u5b9a\uff08ICMP\uff09\u904b\u884c\uff0c\u5411\u76ee\u6a19\u4f3a\u670d\u5668\u767c\u9001\u56de\u986f\u8acb\u6c42\u8cc7\u6599\u5c01\u5305\u4e26\u6e2c\u91cf\u5f80\u8fd4\u6642\u9593\uff08RTT\uff09\u3002\u96d6\u7136\u9019\u500b\u6982\u5ff5\u770b\u4f3c\u7c21\u55ae\uff0c\u4f46\u5176\u5e95\u5c64\u6a5f\u5236\u6d89\u53ca\u8907\u96dc\u7684\u7db2\u8def\u4e92\u52d5\uff0c\u9700\u8981\u4ed4\u7d30\u7814\u7a76\u3002<\/p>\n

\r\n# \u57fa\u672cping\u6307\u4ee4\u7d50\u69cb\r\nping [options] host\r\n\r\n# \u5e38\u7528\u53c3\u6578\u793a\u4f8b\r\nping -c 5 -i 0.5 -s 56 hostname.com\r\n# -c: \u8cc7\u6599\u5c01\u5305\u6578\u91cf\r\n# -i: \u8cc7\u6599\u5c01\u5305\u9593\u9694\r\n# -s: \u8cc7\u6599\u5c01\u5305\u5927\u5c0f\uff08\u4f4d\u5143\u7d44\uff09\r\n<\/code><\/pre>\n
\u9032\u968ePing\u6e2c\u8a66\u6280\u8853<\/strong><\/h2>\n
\u5c08\u696d\u4f3a\u670d\u5668\u7ba1\u7406\u54e1\u901a\u5e38\u9700\u8981\u6bd4\u6a19\u6e96ping\u6307\u4ee4\u66f4\u8907\u96dc\u7684\u6e2c\u8a66\u65b9\u6cd5\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u80fd\u63d0\u4f9b\u66f4\u6df1\u5165\u4f3a\u670d\u5668\u6548\u80fd\u6d1e\u5bdf\u7684\u9032\u968e\u6280\u8853\uff1a<\/p>\n
\r\n# \u9032\u968eping\u6e2c\u8a66\u8173\u672c\r\n#!\/bin\/bash\r\nSERVER=\"your-us-server.com\"\r\nPING_COUNT=100\r\nINTERVAL=0.2\r\n\r\necho \"\u958b\u59cb\u5c0d $SERVER \u9032\u884c\u5168\u9762ping\u6e2c\u8a66\"\r\nping -c $PING_COUNT -i $INTERVAL $SERVER | tee ping_results.log\r\n\r\n# \u8a08\u7b97\u7d71\u8a08\u8cc7\u6599\r\navg=$(grep \"avg\" ping_results.log | awk -F '\/' '{print $5}')\r\nloss=$(grep \"packet loss\" ping_results.log | awk '{print $6}')\r\n\r\necho \"\u5e73\u5747\u5ef6\u9072: $avg ms\"\r\necho \"\u5c01\u5305\u907a\u5931\u7387: $loss\"\r\n<\/code><\/pre>\n
\u89e3\u8b80Ping\u6e2c\u8a66\u7d50\u679c<\/strong><\/h2>\n
\u539f\u59cbping\u8cc7\u6599\u9700\u8981\u5728\u60a8\u7279\u5b9a\u4f7f\u7528\u6848\u4f8b\u7684\u80cc\u666f\u4e0b\u4ed4\u7d30\u89e3\u8b80\u3002\u5c0d\u65bc\u7f8e\u570b\u4f3a\u670d\u5668\uff0c\u8acb\u8003\u616e\u4ee5\u4e0b\u57fa\u6e96\u6307\u6a19\uff1a<\/p>\n
\n
\u6975\u4f73\uff1a< 20ms<\/li>\n
\u826f\u597d\uff1a20-50ms<\/li>\n
\u53ef\u63a5\u53d7\uff1a50-100ms<\/li>\n
\u8f03\u5dee\uff1a> 100ms<\/li>\n<\/ul>\n
\u5730\u7406\u4f4d\u7f6e\u5c0dPing\u6548\u80fd\u7684\u5f71\u97ff<\/strong><\/h2>\n
\u5728\u6e2c\u8a66\u7f8e\u570b\u4f3a\u670d\u5668\u79df\u7528\u89e3\u6c7a\u65b9\u6848\u6642\uff0c\u5730\u7406\u5206\u5e03\u986f\u8457\u5f71\u97ff\u5ef6\u9072\u3002\u5728\u6700\u4f73\u689d\u4ef6\u4e0b\uff0c\u7f8e\u570b\u6771\u6d77\u5cb8\u5230\u897f\u6d77\u5cb8\u7684ping\u6642\u9593\u901a\u5e38\u572850-80ms\u7bc4\u570d\u5167\u3002\u4ee5\u4e0b\u662f\u5730\u7406\u6e2c\u8a66\u7684\u5be6\u7528\u65b9\u6cd5\uff1a<\/p>\n
\r\n# \u591a\u5730\u9edeping\u6e2c\u8a66\r\nfor location in \"nyc.node\" \"sf.node\" \"dallas.node\" \"chicago.node\"\r\ndo\r\n    echo \"\u5f9e $location \u9032\u884c\u6e2c\u8a66\"\r\n    mtr --report --report-cycles=10 your-server.com\r\ndone\r\n<\/code><\/pre>\n
\u7db2\u8def\u8def\u5f91\u5206\u6790<\/strong><\/h2>\n
\u4e86\u89e3\u5ba2\u6236\u7aef\u8207\u7f8e\u570b\u4f3a\u670d\u5668\u4e4b\u9593\u7684\u7db2\u8def\u8def\u5f91\u53ef\u4ee5\u63d0\u4f9b\u5ef6\u9072\u4f86\u6e90\u7684\u91cd\u8981\u8cc7\u8a0a\u3002Traceroute\u548cMTR\uff08My TracerRoute\uff09\u63d0\u4f9b\u8a73\u7d30\u7684\u8def\u5f91\u5206\u6790\uff1a<\/p>\n
\r\n# \u8a73\u7d30MTR\u5206\u6790\r\nmtr --report-wide --show-ips --tcp --port=80 your-server.com\r\n\r\n# TCP\u5c08\u7528traceroute\r\ntraceroute -T -p 80 your-server.com\r\n<\/code><\/pre>\n
\u512a\u5316\u4f3a\u670d\u5668\u56de\u61c9\u6642\u9593<\/strong><\/h2>\n
\u6536\u96c6\u5b8c\u6574\u7684ping\u8cc7\u6599\u5f8c\uff0c\u8acb\u95dc\u6ce8\u4ee5\u4e0b\u6700\u4f73\u5316\u7b56\u7565\uff1a<\/p>\n
\n
\u8a2d\u5b9aTCP\/IP\u5354\u5b9a\u5806\u758a\u6700\u4f73\u5316\n
\r\n# \u7de8\u8f2f \/etc\/sysctl.conf\r\nnet.ipv4.tcp_fin_timeout = 15\r\nnet.ipv4.tcp_keepalive_time = 300\r\nnet.ipv4.tcp_max_syn_backlog = 4096\r\nnet.core.rmem_max = 16777216\r\nnet.core.wmem_max = 16777216\r\n        <\/code><\/pre>\n<\/li>\n
\u5be6\u65bd\u9069\u7576\u7684MTU\u6700\u4f73\u5316\n
\r\n# \u6aa2\u67e5\u76ee\u524dMTU\r\nip link show eth0 | grep mtu\r\n\r\n# \u8a2d\u5b9a\u6700\u4f73MTU\r\nip link set eth0 mtu 1500\r\n        <\/code><\/pre>\n<\/li>\n<\/ul>\n
\u9577\u671f\u76e3\u63a7\u89e3\u6c7a\u65b9\u6848<\/strong><\/h2>\n
\u5be6\u65bd\u81ea\u52d5\u5316\u76e3\u63a7\u4ee5\u9577\u671f\u8ffd\u8e64\u4f3a\u670d\u5668\u6548\u80fd\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u4f46\u6709\u6548\u7684\u76e3\u63a7\u8173\u672c\uff1a<\/p>\n
\r\n#!\/bin\/bash\r\n# \u5e36\u6642\u9593\u6233\u8a18\u7684\u6301\u7e8cping\u76e3\u63a7\r\nwhile true; do\r\n    timestamp=$(date '+%Y-%m-%d %H:%M:%S')\r\n    result=$(ping -c 1 your-us-server.com | grep \"time=\")\r\n    echo \"$timestamp: $result\" >> ping_monitor.log\r\n    sleep 60\r\ndone\r\n<\/code><\/pre>\n
\u5e38\u898b\u554f\u984c\u548c\u6545\u969c\u6392\u9664<\/strong><\/h2>\n
\u5728\u8655\u7406\u7f8e\u570b\u4f3a\u670d\u5668\u79df\u7528\u74b0\u5883\u6642\uff0c\u4ee5\u4e0b\u5e7e\u500b\u5e38\u898b\u554f\u984c\u53ef\u80fd\u6703\u5f71\u97ffping\u6548\u80fd\uff1a<\/p>\n
\n
\u5c16\u5cf0\u6642\u6bb5\u7684\u7db2\u8def\u58c5\u585e<\/li>\n
\u8def\u7531\u6700\u4f73\u5316\u554f\u984c<\/li>\n
DNS\u89e3\u6790\u5ef6\u9072<\/li>\n
\u9632\u706b\u7246\u8a2d\u5b9a\u554f\u984c<\/li>\n<\/ul>\n
\u8981\u8a3a\u65b7\u9019\u4e9b\u554f\u984c\uff0c\u8acb\u4f7f\u7528\u4ee5\u4e0b\u7d9c\u5408\u6e2c\u8a66\u65b9\u6cd5\uff1a<\/p>\n
\r\n# DNS\u89e3\u6790\u6e2c\u8a66\r\ndig +trace your-us-server.com\r\n\r\n# \u6aa2\u67e5\u8cc7\u6599\u5c01\u5305\u5206\u5272\r\nping -M do -s 1472 your-us-server.com\r\n\r\n# \u6e2c\u8a66\u4e0d\u540c\u5354\u5b9a\r\ntcping -t 5 your-us-server.com 80\r\ntcping -t 5 your-us-server.com 443\r\n<\/code><\/pre>\n
\u4f01\u696d\u7d1a\u6e2c\u8a66\u6700\u4f73\u5be6\u52d9<\/strong><\/h2>\n
\u4f01\u696d\u74b0\u5883\u9700\u8981\u56b4\u8b39\u7684\u6e2c\u8a66\u65b9\u6cd5\u3002\u5be6\u65bd\u4ee5\u4e0b\u5c08\u696d\u7d1a\u5be6\u52d9\u4ee5\u7372\u5f97\u6700\u4f73\u7d50\u679c\uff1a<\/p>\n
\r\n# \u4f01\u696d\u7d1a\u6e2c\u8a66\u8173\u672c\r\n#!\/bin\/bash\r\nSERVERS=(\r\n    \"us-east.server.com\"\r\n    \"us-west.server.com\"\r\n    \"us-central.server.com\"\r\n)\r\n\r\nfor server in \"${SERVERS[@]}\"; do\r\n    echo \"=== \u6e2c\u8a66 $server ===\"\r\n    # \u5ef6\u9072\u6e2c\u8a66\r\n    ping -c 100 -i 0.2 $server > \"${server}_ping.log\"\r\n    # \u8def\u5f91\u5206\u6790\r\n    mtr --report $server > \"${server}_mtr.log\"\r\n    # TCP\u9023\u7dda\u6e2c\u8a66\r\n    for port in 80 443 3306; do\r\n        nc -zv -w 2 $server $port\r\n    done\r\ndone\r\n<\/code><\/pre>\n
\u6548\u80fd\u57fa\u6e96\u6e2c\u8a66\u6a19\u6e96<\/strong><\/h2>\n
\u4f7f\u7528\u4ee5\u4e0b\u6307\u6a19\u70ba\u60a8\u7684\u7f8e\u570b\u4f3a\u670d\u5668\u57fa\u790e\u8a2d\u65bd\u5efa\u7acb\u660e\u78ba\u7684\u57fa\u6e96\u6e2c\u8a66\u6a19\u6e96\uff1a<\/p>\n