Author Archives: cowman.chiang

[Java] Append string with adaptive font size to image

Posted on 2021 年 05 月 04 日 by cowman.chiang

Ref: https://blog.csdn.net/zengrenyuan/article/details/80281738 public static ByteArrayOutputStream encodeWithWaterMark(String content) { if (FRONT_IMAGE == null) { return encode(content); } ByteArrayOutputStream os = null; try { BitMatrix matrix = new QRCodeWriter().encode(content, BarcodeFormat.QR_CODE, WIDTH, HEIGHT); BufferedImage backImage = QRCodeUtils.toBufferedImage(matrix); int fontSize = 20; String stringContent … Continue reading →

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[Docker] time sync with host

Posted on 2020 年 03 月 26 日 by cowman.chiang

docker run -v /etc/localtime:/etc/localtime:ro -i -t mattdm/fedora /bin/bash Source: stackoverflow: How to make sure docker’s time syncs with that of the host?

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[Docker] Common commands

Posted on 2019 年 06 月 24 日 by cowman.chiang

show all containers: docker ps -a stop all containers: docker kill $(docker ps -q) remove all containers: docker rm $(docker ps -a -q) remove all docker images: docker rmi $(docker images -q) enter docker container: docker exec -it $(container id) … Continue reading →

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[HBase] security issue

Posted on 2019 年 03 月 18 日 by cowman.chiang

error message: com.a.b.c.exception.BaseDAOException: org.apache.hadoop.hbase.security.AccessDeniedException: org.apache.hadoop.hbase.security.AccessDeniedException: Insufficient permissions for user ‘Cowman’ (table=ABC, action=READ) in jvm conf. add “-DHADOOP_USER_NAME=webuser”

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[Apache] wordpress permalink 404 issue

Posted on 2018 年 11 月 15 日 by cowman.chiang

edit site conf (vim /etc/apache2/sites-available/pr.site.org.conf) <VirtualHost pr.site.org:80> ServerName pr.site.org ServerAdmin webmaster@localhost DocumentRoot /var/www/pr.site.org # !– add this section <Directory /var/www/pr.site.org> Options Indexes FollowSymLinks MultiViews AllowOverride All Order allow,deny allow from all </Directory> # !– ErrorLog ${APACHE_LOG_DIR}/pr_error.log CustomLog ${APACHE_LOG_DIR}/pr_access.log combined </VirtualHost> … Continue reading →

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[HBase] convert long value to bytes

Posted on 2018 年 11 月 13 日 by cowman.chiang

Java code: public static void main(String[] args) { String stringValue = Bytes.toStringBinary(Bytes.toBytes(1532080782183l)); System.out.println(stringValue); Long longValue = Bytes.toLong(Bytes.toBytesBinary(stringValue)); System.out.println(longValue); } HBase shell command: hbase(main):056:0> Bytes.toStringBinary(Bytes.to_bytes(1532080782183)) => “\\x00\\x00\\x01d\\xB7!{g” hbase(main):057:0> Bytes.toLong(“\x00\x00\x01d\xB7!{g”.to_java_bytes) => 1532080782183

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[Intellij] Checkstyle and Code Style

Posted on 2018 年 10 月 17 日 by cowman.chiang

Checkstyle 介紹 根據定義好的規則對程式碼進行檢查，以確保程式碼的 Style 是一致的 (盡力…) Checkstyle GitHub 有提供兩種規則範例，後續套用的規則即是使用 “Google Checks” 進行修改 Sun Checks Google Checks 安裝 Checkstyle Preferences.. ➔ Plugins ➔ Browse repositories.. -> 搜尋 “CheckStyle” 安裝 “CheckStyle-IDEA” Checkstyle 規則文件說明 checkstyle/qmi_checks.xml 為 Checkstyle 主規則檔案 定義檢查的檔案格式、範圍 定義排除的規則檔案位置 (通常為 suppressions.xml) 定義檢查的項目，每一個項目可定義的屬性不固定，需檢視 … Continue reading →

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[Docker] The crontab is not work in docker

Posted on 2018 年 09 月 11 日 by cowman.chiang

Source: docker容器内cron不执行 vim /etc/pam.d/crond # The PAM configuration file for the cron daemon # # No PAM authentication called, auth modules not needed account required pam_access.so account sufficient pam_access.so account include password-auth session required pam_loginuid.so session sufficient pam_loginuid.so session include … Continue reading →

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[Git] edit commit message after push

Posted on 2018 年 07 月 26 日 by cowman.chiang

Source: stackopenflow: Changing git commit message after push (given that no one pulled from remote) git comment –amend git push –force

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[Python] fix error while loading shared libraries: libpython2.7.so.1.0

Posted on 2018 年 07 月 19 日 by cowman.chiang

error log: /opt/rh/python27/root/usr/bin/python: error while loading shared libraries: libpython2.7.so.1.0: cannot open shared object file: No such file or directory check libpython2.7.so.1.0 exist? find . -name ‘libpython2.7.so.1.0’ if the file was exist: edit the ldconfig config echo “/opt/rh/python27/root/usr/lib64” > /etc/ld.so.conf.d/python27.conf ldconfig … Continue reading →

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