First api tests

README.md

@@ -12,4 +12,5 @@
 * [inotify](inotify.md)
 * [Manual installation](manual_installation.md)
 * [Manual maintenance](manual_maintenance.md)
+* [MDS Events](mds_logging.md)
 * [Puppet module](puppet_module.md)

api/README.md

+yum install devtoolset-9-gcc*
+scl enable devtoolset-9 bash
+yum install librbd1-devel
+yum install librados2-devel
+yum install python-rados
+
+g++ example1.cpp -lrados -o example

api/example1.cpp

+#include <iostream>
+#include <string>
+#include <rados/librados.hpp>
+ 
+int main(int argc, const char **argv)
+{
+  int ret = 0;
+  /* Declare the cluster handle and required variables. */
+  librados::Rados cluster;
+  char cluster_name[] = "ceph";
+  char user_name[] = "client.admin";
+  uint64_t flags = 0;
+
+  ret = cluster.init2(user_name, cluster_name, flags);
+  if (ret < 0) {
+    std::cerr << "Couldn't initialize the cluster handle! error " << ret << std::endl;
+    return EXIT_FAILURE;
+  } else {
+           std::cout << "Created a cluster handle." << std::endl;
+  }
+
+  ret = cluster.conf_read_file("/etc/ceph/ceph.conf");
+  if (ret < 0) {
+    std::cerr << "Couldn't read the Ceph configuration file! error " << ret << std::endl;
+    return EXIT_FAILURE;
+  } else {
+      std::cout << "Read the Ceph configuration file." << std::endl;
+  }
+
+  ret = cluster.connect();
+  if (ret < 0) {
+     std::cerr << "Couldn't connect to cluster! error " << ret << std::endl;
+     return EXIT_FAILURE;
+  } else {
+      std::cout << "Connected to the cluster." << std::endl;
+  }
+
+  return 0;
+}

api/example2.cpp

+#include <iostream>
+#include <string>
+#include <rados/librados.hpp>
+ 
+int main(int argc, const char **argv)
+{
+  int ret = 0;
+  /* Declare the cluster handle and required variables. */
+  librados::Rados cluster;
+  char cluster_name[] = "ceph";
+  char user_name[] = "client.admin";
+  uint64_t flags = 0;
+
+  ret = cluster.init2(user_name, cluster_name, flags);
+  if (ret < 0) {
+    std::cerr << "Couldn't initialize the cluster handle! error " << ret << std::endl;
+    return EXIT_FAILURE;
+  } else {
+           std::cout << "Created a cluster handle." << std::endl;
+  }
+
+  ret = cluster.conf_read_file("/etc/ceph/ceph.conf");
+  if (ret < 0) {
+    std::cerr << "Couldn't read the Ceph configuration file! error " << ret << std::endl;
+    return EXIT_FAILURE;
+  } else {
+      std::cout << "Read the Ceph configuration file." << std::endl;
+  }
+
+  ret = cluster.connect();
+  if (ret < 0) {
+     std::cerr << "Couldn't connect to cluster! error " << ret << std::endl;
+     return EXIT_FAILURE;
+  } else {
+      std::cout << "Connected to the cluster." << std::endl;
+  }
+
+  librados::IoCtx io_ctx;
+
+  const char *pool_name = "ec62";
+
+  ret = cluster.ioctx_create(pool_name, io_ctx);
+  if (ret < 0) {
+    std::cerr << "Couldn't set up ioctx! error " << ret << std::endl;
+    exit(EXIT_FAILURE);
+  } else {
+      std::cout << "Created an ioctx for the pool." << std::endl;
+  }
+
+
+
+  librados::bufferlist bl;
+  bl.append("Hello World!");
+  ret = io_ctx.write_full("rados_write_example", bl);
+  if (ret < 0) {
+    std::cerr << "Couldn't write object! error " << ret << std::endl;
+    exit(EXIT_FAILURE);
+  } else {
+      std::cout << "Wrote new object 'rados_write_example' " << std::endl;
+  }
+
+  return 0;
+}

mds_logging.md

+### MDS logging
+This will enhance 
+```
+ceph tell mds.0 injectargs --debug-mds 5/5
+```
+Si possono captare dal log gli eventi sul filesystem
+```
+tail -f /var/log/ceph/ceph-mds.cs-001.log | grep metablob
+```
+
+
+