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Ceph分布式存储实践应用之集群测试验证(Rados运用)

互联网 diligentman 2周前 (04-06) 8次浏览

1. 创建Cephfs

集群创建完后, 默认没有文件系统,要是实现文件的存储操作,我们还需创建一个Cephfs可以支持对外访问的文件系统。

  1. 创建两个存储池, 执行两条命令:

    ceph osd pool create cephfs_data 128
    ceph osd pool create cephfs_metadata 64
    

    少于5个OSD可把pg_num设置为128

    OSD数量在5到10,可以设置pg_num为512

    OSD数量在10到50,可以设置pg_num为4096

    OSD数量大于50,需要计算pg_num的值

    通过下面命令可以列出当前创建的存储池:

    ceph osd lspools
    
  2. 创建fs, 名称为fs_test:

    ceph fs new fs_test cephfs_metadata cephfs_data
    
  3. 状态查看, 以下信息代表正常:

    [root@CENTOS7-1 mgr-dashboard]# ceph fs ls
    name: fs_test, metadata pool: cephfs_metadata, data pools: [cephfs_data ]
    
    [root@CENTOS7-1 mgr-dashboard]# ceph mds stat
    fs_test-1/1/1 up  {0=centos7-1=up:active}
    

    附: 如果创建错误, 需要删除, 执行:

    ceph fs rm fs_test --yes-i-really-mean-it
    ceph osd pool delete cephfs_data cephfs_data  --yes-i-really-really-mean-it
    

    确保在ceph.conf中开启以下配置:

    [mon]
    mon allow pool delete = true
    
  4. 采用fuse挂载

    先确定ceph-fuse命令能执行, 如果没有, 则安装

     yum -y install ceph-fuse
    
  5. 创建挂载目录

    mkdir -p /usr/local/cephfs_directory
    
  6. 挂载cephfs

    [root@node3 ~]# ceph-fuse -k /etc/ceph/ceph.client.admin.keyring -m 10.10.20.11:6789 /usr/local/cephfs_directory
    ceph-fuse[6687]: starting ceph client
    2019-07-14 21:39:09.644181 7fa5be56e040 -1 init, newargv = 0x7fa5c940b500 newargc=9
    ceph-fuse[6687]: starting fuse
    
  7. 查看磁盘挂载信息

    [root@CENTOS7-1 mgr-dashboard]# df -h
    Filesystem               Size  Used Avail Use% Mounted on
    /dev/mapper/centos-root   38G  3.0G   35G   8% /
    devtmpfs                 1.9G     0  1.9G   0% /dev
    tmpfs                    1.9G     0  1.9G   0% /dev/shm
    tmpfs                    1.9G   20M  1.9G   2% /run
    tmpfs                    1.9G     0  1.9G   0% /sys/fs/cgroup
    /dev/sda1                197M  167M   31M  85% /boot
    tmpfs                    378M     0  378M   0% /run/user/0
    tmpfs                    1.9G   24K  1.9G   1% /var/lib/ceph/osd/ceph-0
    ceph-fuse                 27G     0   27G   0% /usr/local/cephfs_directory
    tmpfs                    378M     0  378M   0% /run/user/1000
    
    

    /usr/local/cephfs_directory目录已成功挂载。

2. 客户端连接验证(Rados Java)

  1. 安装好JDK、GIT和MAVEN。

  2. 下载rados java客户端源码

    git clone https://github.com/ceph/rados-java.git

    下载目录位置:

    [root@CENTOS7-1 rados-java]# pwd
    /usr/local/sources/rados-java
    
  3. 执行MAVEN安装, 忽略测试用例:

    [root@CENTOS7-1 rados-java]# mvn install -Dmaven.test.skip=true
    

    生成jar包, rados-0.6.0-SNAPSHOT.jar

    [root@CENTOS7-1 target]# ll
    total 104
    drwxr-xr-x 3 root root     17 Jul 14 19:31 classes
    drwxr-xr-x 2 root root     27 Jul 14 19:31 dependencies
    drwxr-xr-x 3 root root     25 Jul 14 19:31 generated-sources
    drwxr-xr-x 2 root root     28 Jul 14 19:31 maven-archiver
    drwxr-xr-x 3 root root     35 Jul 14 19:31 maven-status
    -rw-r--r-- 1 root root 105570 Jul 14 19:31 rados-0.6.0-SNAPSHOT.jar
    
  4. 创建软链接, 加入CLASSPATH

    ln -s /usr/local/sources/rados-java/target/rados-0.6.0-SNAPSHOT.jar /usr/local/jdk1.8.0_181/jre/lib/ext/rados-0.6.0-SNAPSHOT.jar
    

    安装jna

    yum -y install jna
    

    创建软链接

    ln -s /usr/share/java/jna.jar /usr/local/jdk1.8.0_181/jre/lib/ext/jna.jar
    

    查看

    [root@CENTOS7-1 target]# ll /usr/local/jdk1.8.0_181/jre/lib/ext/jna.jar 
    lrwxrwxrwx 1 root root 23 Jul 14 10:23 /usr/local/jdk1.8.0_181/jre/lib/ext/jna.jar -> /usr/share/java/jna.jar
    
    [root@CENTOS7-1 target]# ll /usr/local/jdk1.8.0_181/jre/lib/ext/rados-0.6.0-SNAPSHOT.jar 
    lrwxrwxrwx 1 root root 40 Jul 14 10:25 /usr/local/jdk1.8.0_181/jre/lib/ext/rados-0.6.0-SNAPSHOT.jar -> /usr/share/java/rados-0.6.0-SNAPSHOT.jar
    
  5. 创建JAVA测试类

    CephClient类,注意, 最新版0.6的异常处理包位置已发生变化。

    import com.ceph.rados.Rados;
    import com.ceph.rados.exceptions.*;
    
    import java.io.File;
    
    public class CephClient {
            public static void main (String args[]){
    
                    try {
                            Rados cluster = new Rados("admin");
                            System.out.println("Created cluster handle.");
    
                            File f = new File("/etc/ceph/ceph.conf");
                            cluster.confReadFile(f);
                            System.out.println("Read the configuration file.");
    
                            cluster.connect();
                            System.out.println("Connected to the cluster.");
    
                    } catch (RadosException e) {
                            System.out.println(e.getMessage() + ": " + e.getReturnValue());
                    }
            }
    }
    
  6. 运行验证

    需要在linux环境下运行,且要在client节点。

    编译并运行:

    [root@CENTOS7-1 sources]# javac CephClient.java 
    [root@CENTOS7-1 sources]# java CephClient
    Created cluster handle.
    Read the configuration file.
    Connected to the cluster.
    

    成功与ceph建立连接。

3. Ceph与项目集成使用

  1. 工程设计

    演示经常使用的文件上传与下载功能, 看java是如何在项目中使用。

  2. 工程结构 创建一个Spring Boot工程,创建一个是启动类和一个ceph操作封装类。

  3. 工程实现

    CephDemoApplication启动类:

    @SpringBootApplication
    public class CephDemoApplication {
    
        public static void main(String[] args) {
    
            System.out.println("start....");
            String username = "admin";
            String monIp = "10.10.20.11:6789;10.10.20.12:6789;10.10.20.13:6789";
            String userKey = "AQBZBypdMchvBRAAbWVnIGyYNvxWQZ2UkuiYew==";
            String mountPath = "/";
            CephOperator cephOperate = null;
            try {
                String opt = (args == null || args.length < 1)? "" : args[0];
                cephOperate = new CephOperator(username, monIp, userKey, mountPath);
                if("upload".equals(opt)) {
                    cephOperate.uploadFileByPath("/temp_upload_fs", args[1]);
                }else if("download".equals(opt)) {
                    cephOperate.downloadFileByPath("/temp_download_fs", args[1]);
                }else {
                    System.out.println("Unrecognized Command! Usage  opt[upload|download] filename[path]!");
                }
            }catch(Exception e) {
                e.printStackTrace();
            }finally {
                if(null != cephOperate) {
                    cephOperate.umount();
                }
            }
            System.out.println("end....");
    
        }
    
    }
    

    monIp为ceph client节点连接地址与端口, 支持多个;

    userKey为密钥, 对应ceph.client.admin.keyring中的key值。

    启动接收两个参数, 一个是标识上传或下载, 另一个是标识文件名称。

    CephOperator操作类的实现:

    public class CephOperator {
    
        private CephMount mount;
        private String username;
        private String monIp;
        private String userKey;
    
        public CephOperator(String username, String monIp, String userKey, String mountPath) {
            this.username = username;
            this.monIp = monIp;
            this.userKey = userKey;
            this.mount = new CephMount(username);
            this.mount.conf_set("mon_host", monIp);
            mount.conf_set("key", userKey);
            mount.mount(mountPath);
        }
    
        //查看目录列表
        public void listDir(String path) throws IOException {
            String[] dirs = mount.listdir(path);
            System.out.println("contents of the dir: " + Arrays.asList(dirs));
        }
    
        //新建目录
        public void mkDir(String path) throws IOException {
            mount.mkdirs(path, 0755);//0表示十进制
        }
    
        //删除目录
        public void delDir(String path) throws IOException {
            mount.rmdir(path);
        }
    
        //重命名目录or文件
        public void renameDir(String oldName, String newName) throws IOException {
            mount.rename(oldName, newName);
        }
    
        //删除文件
        public void delFile(String path) throws IOException {
            mount.unlink(path);
        }
    
        /**
         * 上传指定路径文件
         * @param filePath
         * @param fileName
         * @return
         */
        public Boolean uploadFileByPath(String filePath, String fileName) {
    
            // 如果mount操作单元为空则直接返回
            if (this.mount == null) {
                return null;
            }
            // 文件描述信息定义
            char pathChar = File.separatorChar;
            String fileFullName = "";
            Long fileLength = 0l;
            Long uploadedLength = 0l;
            File file = null;
    
            // 定义文件流
            FileInputStream fis = null;
    
            // 获取本地文件信息
            fileFullName = filePath + pathChar + fileName;
            file = new File(fileFullName);
            if (!file.exists()) {
                return false;
            }
            fileLength = file.length();
    
            // 获取本地文件流
            try {
                fis = new FileInputStream(file);
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
    
            // 判断文件是否已经存在
            String[] dirList = null;
            Boolean fileExist = false;
            try {
                dirList = this.mount.listdir("/");
                for (String fileInfo : dirList) {
                    if (fileInfo.equals(fileName)) {
                        fileExist = true;
                    }
                }
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
    
            if (!fileExist) {
                try {
                    // 创建文件并设置为写入模式
                    this.mount.open(fileName, CephMount.O_CREAT, 0);
                    int fd = this.mount.open(fileName, CephMount.O_RDWR, 0);
    
                    // 开始文件传输
                    int length = 0;
                    byte[] bytes = new byte[1024];
                    while ((length = fis.read(bytes, 0, bytes.length)) != -1) {
                        // 上传写入数据
                        this.mount.write(fd, bytes, length, uploadedLength); 
    
                        // 更新上传进度
                        uploadedLength += length;
    
                        // 输出上传百分比
                        float rate = (float) uploadedLength * 100 / (float) fileLength;
                        String rateValue = (int) rate + "%";
                        System.out.println(rateValue);
    
                        // 上传完成后退出
                        if (uploadedLength == fileLength) {
                            break;
                        }
                    }
                    System.out.println("文件传输成功!");
    
                    // 设置文件权限
                    this.mount.fchmod(fd, 0666);
    
                    // 关闭操作
                    this.mount.close(fd);
                    if (fis != null) {
                        fis.close();
                    }
                    return true;
                } catch (Exception e) {
                    e.printStackTrace();
                }
            } else if (fileExist) {
                try {
                    // 获取文件大小
                    CephStat stat = new CephStat();
                    this.mount.stat(fileName, stat);
                    long lastLen= stat.size;
                    int fd = this.mount.open(fileName, CephMount.O_RDWR, 0);
    
                    // 开始文件传输
                    int length = 0;
                    byte[] bytes = new byte[1024];
                    long uploadActLen= 0;
                    while ((length = fis.read(bytes, 0, bytes.length)) != -1) {
                        // 更新写入
                        this.mount.write(fd, bytes, length, lastLen);
    
                        // 更新文件大小
                        uploadActLen += length;
                        // 更新文件上传百分比
                        float rate = (float) uploadActLen * 100 / (float) fileLength;
                        String rateValue = (int) rate + "%";
                        System.out.println(rateValue);
    
                        // complete flag
                        if (uploadActLen == fileLength) {
                            break;
                        }
                    }
                    // 多次上传会进行追加
                    System.out.println("追加文件传输成功!");
    
                    // 设置文件权限
                    this.mount.fchmod(fd, 0666);
    
                    // 关闭操作
                    this.mount.close(fd);
                    if (fis != null) {
                        fis.close();
                    }
                    return true;
                } catch (Exception e) {
                    e.printStackTrace();
                }
            } else {
                try {
                    if (fis != null) {
                        fis.close();
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
                return false;
            }
    
            return false;
        }
    
        // 设置当前的工作上传目录
        public void setWorkDir(String path) throws IOException {
            mount.chdir(path);
        }
    
        //外部获取mount
        public CephMount getMount() {
            return this.mount;
        }
    
        // 取消文件挂载
        public void umount() {
            mount.unmount();
        }
    
        /**
         * 下载文件到指定路径
         * @param filePath
         * @param fileName
         * @return
         */
        public Boolean downloadFileByPath(String filePath, String fileName) {
    
            // 如果mount操作单元为空则直接返回
            if (this.mount == null) {
                return null;
            }
    
            // 文件描述信息定义
            char pathChar = File.separatorChar;
            String fileFullName = "";
            Long fileLength = 0l;
            Long downloadedLength = 0l;
            File file = null;
    
            // 定义文件流
            FileOutputStream fos = null;
            RandomAccessFile raf = null;
    
            // 创建新的文件
            fileFullName = filePath + pathChar + fileName;
            file = new File(fileFullName);
    
            // 获取 cephfs 的文件大小
            try {
                CephStat stat = new CephStat();
                this.mount.stat(fileName, stat);
                fileLength = stat.size;
            } catch (Exception e) {
                e.printStackTrace();
            }
    
            if (fileLength != 0) {
                if (!file.exists()) {
                    // 下载文件
                    int length = 10240;
                    byte[] bytes = new byte[length];
                    try {
                        int fd = this.mount.open(fileName, CephMount.O_RDONLY, 0);
                        fos = new FileOutputStream(file);
                        float rate = 0;
                        String rateValue = "";
                        while ((fileLength - downloadedLength) >= length && (this.mount.read(fd, bytes, (long) length, downloadedLength)) != -1) {
                            fos.write(bytes, 0, length);
                            fos.flush();
                            downloadedLength += (long) length;
    
                            // 输出进度百分比
                            rate = (float) downloadedLength * 100 / (float) fileLength;
                            rateValue = (int) rate + "%";
                            System.out.println(rateValue);
    
                            if (downloadedLength == fileLength) {
                                break;
                            }
                        }
                        if (downloadedLength != fileLength) {
                            this.mount.read(fd, bytes, fileLength - downloadedLength, downloadedLength);
                            fos.write(bytes, 0, (int) (fileLength - downloadedLength));
                            fos.flush();
                            downloadedLength = fileLength;
    
                            // 输出进度百分比
                            rate = (float) downloadedLength * 100 / (float) fileLength;
                            rateValue = (int) rate + "%";
                            System.out.println(rateValue);
                        }
    
                        System.out.println("Download Success!");
                        fos.close();
                        this.mount.close(fd);
                        return true;
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                } else if (file.exists()) {
                    // 下载文件
                    int length = 10240;
                    byte[] bytes = new byte[length];
                    Long filePoint = file.length();
                    try {
                        int fd = this.mount.open(fileName, CephMount.O_RDONLY, 0);
                        raf = new RandomAccessFile(file, "rw");
                        raf.seek(filePoint);
                        downloadedLength = filePoint;
                        float rate = 0;
                        String rateValue = "";
                        while ((fileLength - downloadedLength) >= length && (this.mount.read(fd, bytes, (long) length, downloadedLength)) != -1) {
                            raf.write(bytes, 0, length);
                            downloadedLength += (long) length;
    
                            // 输出进度百分比
                            rate = (float) downloadedLength * 100 / (float) fileLength;
                            rateValue = (int) rate + "%";
                            System.out.println(rateValue);
    
                            if (downloadedLength == fileLength) {
                                break;
                            }
                        }
                        if (downloadedLength != fileLength) {
                            this.mount.read(fd, bytes, fileLength - downloadedLength, downloadedLength);
                            raf.write(bytes, 0, (int) (fileLength - downloadedLength));
                            downloadedLength = fileLength;
    
                            // 输出进度百分比
                            rate = (float) downloadedLength * 100 / (float) fileLength;
                            rateValue = (int) rate + "%";
                            System.out.println(rateValue);
                        }
    					// 如果下载中断, 会从上一次下载结束位置进行上传
                        System.out.println("Cut Point Download Success!");
                        raf.close();
                        this.mount.close(fd);
                        return true;
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                } else {
                    return false;
                }
            }else {
                System.out.println(" the file is empty!");
            } 
            return true;   
        }   
    }
    

    POM文件配置:

    <dependencies>
        <!-- Spring Boot 依赖-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    
        <!-- Rados Java Api依赖 -->
        <dependency>
            <groupId>com.ceph</groupId>
            <artifactId>rados</artifactId>
            <version>0.6.0</version>
        </dependency>
    	<!-- Cephfs 文件系统依赖 -->
        <dependency>
            <groupId>com.ceph</groupId>
            <artifactId>libcephfs</artifactId>
            <version>0.80.5</version>
        </dependency>
    </dependencies>
    
    <!--Spring Boot 打包插件 -->
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
    
  4. 测试验证

    通过maven 命令 clean install 打包生成jar文件。

    • rz命令上传至client node服务器

      [root@CENTOS7-1 sources]# ll ceph-demo.jar 
      -rw-r--r-- 1 root root 16915296 Jul 14  2019 ceph-demo.jar
      
    • 代码中的上传目录为/temp_upload_fs,创建名为upload.txt的文件,内容为abc123

      [root@CENTOS7-1 sources]# cat /temp_upload_fs/upload.txt
      abc123
      
    • 上传至cephfs服务

      [root@CENTOS7-1 sources]# java -jar ceph-demo.jar upload upload.txt
      start....
      100%
      文件传输成功!
      end....
      
    • 下载cephfs文件

      文件名称为上传时创建的upload.txt

      [root@CENTOS7-1 sources]# java -jar ceph-demo.jar download upload.txt
      start....
      100%
      Download Success!
      end....
      
    • 查看下载内容

      [root@CENTOS7-1 sources]# cat /temp_download_fs/upload.txt 
      abc123
      

      通过演示, 可以看到能够通过java client 在项目中成功操作ceph。

      ![file](https://oscimg.oschina.net/oscnet/up-10b428d619b5d7314b7dea74bd0a708503f.JPEG)
      
  5. FAQ问题

    1. 如果运行过程当中出现jni找不到动态库, 需要安装相关依赖:

      yum -y install libcephfs2 libcephfs_jni-devel
      

      并检查相应的软链接:

      [root@CENTOS7-1 sources]# ll /usr/lib/libcephfs_jni.so.2 
      lrwxrwxrwx 1 root root 25 Jul 14 11:34 /usr/lib/libcephfs_jni.so.2 -> /usr/lib64/libcephfs.so.2
      
    2. 如果rados版本0.6.0依赖, 需要手工上传至MAVEN仓库,命令:

      mvn deploy:deploy-file -DgroupId=com.ceph -DartifactId=rados -Dversion=2.0.1 -Dpackaging=jar -Dfile=d:/TestCode/rados-0.6.0-SNAPSHOT.jar -url=http://192.168.19.102:8082/repository/maven-releases/ -DrepositoryId=nexus-releases
      

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