Re: [I] KVM agent fails to connect to Ceph RBD storage pool after upgrading Ceph client to Tentacle 20.2.4 [cloudstack]

["akoskuczi-bw (via GitHub)" <gi...@apache.org>]

akoskuczi-bw commented on issue #13989:
URL: https://github.com/apache/cloudstack/issues/13989#issuecomment-5940205575

   Workaround until the libvirtd fix is available
   
   **Save this code as rados_compat.c**
   ```
   #define _GNU_SOURCE
   
   #include <stdio.h>
   #include <string.h>
   #include <dlfcn.h>
   #include <errno.h>
   
   typedef int (*rados_conf_set_fn)(
       void *cluster,
       const char *option,
       const char *value
   );
   
   int rados_conf_set(void *cluster, const char *option, const char *value)
   {
       static rados_conf_set_fn real_rados_conf_set = NULL;
   
       if (option && strcmp(option, "auth_supported") == 0) {
           fprintf(stderr,
                   "[rados-compat] ignoring deprecated option: "
                   "auth_supported=%s\n",
                   value ? value : "(null)");
   
           return 0;
       }
   
       if (!real_rados_conf_set) {
           dlerror();
   
           real_rados_conf_set =
               (rados_conf_set_fn)dlsym(RTLD_NEXT, "rados_conf_set");
   
           const char *err = dlerror();
   
           if (err || !real_rados_conf_set) {
               fprintf(stderr,
                       "[rados-compat] dlsym(rados_conf_set) failed: %s\n",
                       err ? err : "unknown error");
   
               return -EIO;
           }
       }
   
       return real_rados_conf_set(cluster, option, value);
   } 
   ```
   **Then compile and install it:**
   _gcc -shared -fPIC -O2 -Wall -Wextra -o librados_compat.so rados_compat.c -ldl
   install -o root -g root -m 0755 librados_compat.so /usr/local/lib/librados_compat.so_
   
   **Preload it into libvirtd:**
   _systemctl edit libvirtd_
   
   ```
   [Service]
   Environment="LD_PRELOAD=/usr/local/lib/librados_compat.so"
   ```
   _systemctl daemon-reload
   systemctl restart libvirtd
   systemctl restart cloudstack-agent_
   


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