Ubuntu

12 月 14 2014

rsyslog daemon 在 OpenVZ guest 瘋狂佔用 CPU resource

剛幫忙解掉的問題。
某台建立在 OpenVZ 的 Ubuntu 的 rsyslog daemon process 瘋狂佔用 CPU resource。
log 看到的狀況是這樣：

...
Dec 14 06:25:13 Linux rsyslogd-2177: rsyslogd[internal_messages]: 1134916 messages lost due to rate-limiting
Dec 14 06:25:13 Linux rsyslogd: imklog: error reading kernel log - shutting down: Bad file descriptor
Dec 14 06:25:13 Linux rsyslogd: message repeated 498 times: [imklog: error reading kernel log - shutting down: Bad file descriptor]
Dec 14 06:25:19 Linux rsyslogd-2177: rsyslogd[internal_messages]: 1114295 messages lost due to rate-limiting
Dec 14 06:25:19 Linux rsyslogd: imklog: error reading kernel log - shutting down: Bad file descriptor
Dec 14 06:25:19 Linux rsyslogd: message repeated 498 times: [imklog: error reading kernel log - shutting down: Bad file descriptor]
Dec 14 06:25:25 Linux rsyslogd-2177: rsyslogd[internal_messages]: 1805432 messages lost due to rate-limiting
Dec 14 06:25:25 Linux rsyslogd: imklog: error reading kernel log - shutting down: Bad file descriptor
Dec 14 06:25:25 Linux rsyslogd: message repeated 498 times: [imklog: error reading kernel log - shutting down: Bad file descriptor]
...

把 /etc/rsyslog.conf 下列這行註解掉，重新啟動 rsyslog 就搞定了… :-)

$ModLoad imklog   # provides kernel logging support

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8 月 5 2013

[Ubuntu] 安裝 & 設定 libapache2-mod-auth-mysql

這兩天試著在 Ubuntu server 玩 Apache HTTP authentication with MySQL backend 。
記一下幾個要注意的地方：

  • 設定參數在 /usr/share/doc/libapache2-mod-auth-mysql/DIRECTIVES.gz ，可以透過以下這個指令查：
    # dpkg-query --listfiles libapache2-mod-auth-mysql
  • 為避免 Apache 混合使用驗證而導致驗證失敗，加上這行比較保險：
    AuthBasicAuthoritative Off

.htaccess 檔內容大概像這樣：

AuthName "JoeHorn's Secret Web"
AuthType Basic
AuthBasicAuthoritative Off
AuthUserFile /dev/null
Auth_MySQL on
Auth_MySQL_User DB_USERNAME
Auth_MySQL_Password DB_PASSWORD
Auth_MySQL_DB AUTH_INFO_DB
Auth_MySQL_Password_Table AUTH_INFO_TABLE
Auth_MySQL_Username_Field USERNAME_FIELD
Auth_MySQL_Password_Field PASSWORD_FIELD
Auth_MySQL_Empty_Passwords off
Auth_MySQL_Encryption_Types MySQL
Require valid-user

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