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先日ã®JVM Operations Casual Talksã€GCやメモリ管ç†ã«ã¤ã„ã¦ã¾ã¨ã¾ã£ãŸç™ºè¡¨ã‚„ã€ãƒ¢ãƒ‹ã‚¿ãƒªãƒ³ã‚°ã®æ‰‹æ³•ãªã©ã®è©±ãŒèžã‘ã¦ã‚ˆã„会ã§ã—ãŸã€‚ 微妙ã«æ„è˜ãŒé«˜ã¾ã£ã¦ã„ã‚‹ã¨ã“ã‚ã§ã€ãƒ¡ãƒ¢ãƒªä½¿ç”¨é‡ã‚„GCã®çµ±è¨ˆæƒ…å ±ã‚’å–å¾—ã—ã¦ã€GrowthForecastã§ã‚°ãƒ©ãƒ•ã‚’作ã£ã¦ãれるスクリプトを書ãã¾ã—ãŸã€‚ãã‚ŒPlaã€ãã‚ŒFluentdç³»ã®ã‚„ã¤ã§ã™ https://github.com/kazeburo/jstat2gf ã“ã®å…ƒãƒã‚¿ã¯ JVM Operation Casual Talksã§ã®ãƒ¢ãƒªã‚¹ã•ã‚“ã®ç™ºè¡¨ã«ã§ã¦ããŸã‚°ãƒ©ãƒ•ã§ã™ã€‚ã‚れを簡å˜ã«ä½œã‚Œã‚‹ãƒ„ールã«ãªã‚Šã¾ã™ã€‚ æŸJVMã®ãƒ—ãƒã‚»ã‚¹ã«å¯¾ã—ã¦å®Ÿè¡Œã™ã‚‹ã¨ã€ã“ã‚“ãªæ„Ÿã˜ã®ã‚°ãƒ©ãƒ•ã«ãªã‚Šã¾ã™ã€‚上ã‹ã‚‰ã€ŒNEWé ˜åŸŸã€ã€ŒOLDé ˜åŸŸã€ã€ŒPermamenté ˜åŸŸã€ã€Œ1秒ã‚ãŸã‚Šã®Full GCã®å›žæ•°ã€ã€Œ1秒ã‚ãŸã‚Šã®Full GCã«ã‹ã‹ã£ãŸæ™‚é–“ã€ã¨ãªã£ã¦ã„ã¾ã™ã€‚ ãªã‚“ã‹F
Hijacking user sessions with the Heartbleed vulnerability
The Heartbleed issue is actually worse than it might immediately seem (and it seems pretty bad already). In case you’ve been out of the loop, Heartbleed (CVE-2014-0160) is a vulnerability in OpenSSL that allows any remote user to dump some of the contents of the server’s memory. And yes, that’s really bad. The major concern is that a skilled user could craft an exploit that could dump the RSA priv
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ã“ã®é ƒã¯GraphiteやらInfluxDBãŒrrdtoolã«å–ã£ã¦ä»£ã‚られã¤ã¤ã‚ã‚‹ã‚“ã§ã—ょã†ãŒã€rrdtoolã®ã‚³ãƒžãƒ³ãƒ‰å¼•æ•°ã¯ã„ã˜ã£ã¦ã¿ã‚‹ã¨æ„外ã¨æ¥½ã—ã„ã‚‚ã®ã§ã™(人ã«ã‚ˆã‚Šã¾ã™ãŒ)。ã“ã®ã‚ã„ã "rrdtool 誰ãŒä¸€ç•ªã‹ã£ã“ã„ã„グラフæã‘ã‚‹ã‹é¸æ‰‹æ¨©"— æ¡åŽŸç¿”市 (@shoichimasuhara) April 4, 2014 ã¨ã‹æ€ã„ã¤ãã§è¨€ã„ã¾ã—ãŸãŒã€ã¨ã‚Šã‚ãˆãšåºã®å£ã¨ã„ã†ã‹å‰åº§ã¨ã„ã†ã‹ã€ã¨ã‚Šã‚ãˆãšã‚„ã£ã¦è¦‹ã‚‹ã ã‘ã‚„ã£ã¦ã¿ã‚ˆã†ã¨æ€ã„ã¾ã™ MRTG ã¨ã‚Šã‚ãˆãšæ›¸ããªã‚‰ã“ã‚“ãªæ„Ÿã˜ MRTGã®ã‚°ãƒ©ãƒ•ã‚’彷彿ã¨ã•ã›ã¾ã™ã。コマンドラインã¯ã“ã¡ã‚‰ rrdtool graph shoichi.example.com_loadavg5_1.png \ --title "load average 5 of shoichi.example.com" \ --start end-1w --end now \
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