[ https://issues.apache.org/jira/browse/MESOS-8286?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
James Peach updated MESOS-8286: ------------------------------- Summary: Making bind mounds readonly fails with user namespaces. (was: Making bind mounds readonly fails with user namspaces.) > Making bind mounds readonly fails with user namespaces. > ------------------------------------------------------- > > Key: MESOS-8286 > URL: https://issues.apache.org/jira/browse/MESOS-8286 > Project: Mesos > Issue Type: Improvement > Reporter: James Peach > Assignee: James Peach > > When user namespaces are in effect, the additional mounts performed by the > CNI isolator to bind host network files read-only fail. The initial bind > mount succeeds, but the subsequent remount is failing. The reason for the > failure isn't clear to me - there are a number of kernel checks and I don't > know which one is failing yet. > {noformat} > ... > [pid 15609] execve("/home/jpeach/src/mesos/build/src/mesos-containerizer", > ["/home/jpeach/src/mesos/build/src"..., "launch"], 0x7f74a001c450 /* 30 vars > */I1130 17:04:34.281958 15537 containerizer.cpp:2921] Transitioning the state > of container > 0a0fdd6b-9532-4010-913b-5e36cad6f666.c4b9a777-eb6c-4c4a-9c4c-5d39e23373eb > from PREPARING to ISOLATING > ) = 0 > strace: Process 15610 attached > [pid 15610] execve("/home/jpeach/src/mesos/build/src/mesos-containerizer", > ["mesos-containerizer", "network-cni-setup", "--bind_host_files=false", > "--bind_readonly=true", "--etc_hostname_path=/etc/hostnam"..., > "--etc_hosts_path=/etc/hosts", "--etc_resolv_conf=/etc/resolv.co"..., > "--help=false", "--pid=15609", "--rootfs=/tmp/ExecutorType_UserN"...], > 0x58f07f0 /* 24 vars */) = 0 > [pid 15610] mount(NULL, "/", NULL, MS_REC|MS_SLAVE, NULL) = 0 > [pid 15610] mount("/etc/resolv.conf", > "/tmp/ExecutorType_UserNamespaceIsolatorTest_ROOT_USER_DockerTask_DefaultExecutor_IMJpTh/provisioner/containers/0a0fdd6b-9532-4010-913b-5e36cad6f666/containers/c4b9a777-eb6c-4c4a-9c4c-5d39e23373eb/backends/overlay/rootfses/0aaba267-75e7-444a-9f3a-adb22adcf195/etc/resolv.conf", > NULL, MS_BIND, NULL) = 0 > [pid 15610] mount(NULL, > "/tmp/ExecutorType_UserNamespaceIsolatorTest_ROOT_USER_DockerTask_DefaultExecutor_IMJpTh/provisioner/containers/0a0fdd6b-9532-4010-913b-5e36cad6f666/containers/c4b9a777-eb6c-4c4a-9c4c-5d39e23373eb/backends/overlay/rootfses/0aaba267-75e7-444a-9f3a-adb22adcf195/etc/resolv.conf", > NULL, MS_RDONLY|MS_REMOUNT, NULL) = -1 EPERM (Operation not permitted) > [pid 15610] +++ exited with 1 +++ > ... > {noformat} > Note that in this log I've experimentally modified the mount flags, but that > doesn't make any difference. -- This message was sent by Atlassian JIRA (v6.4.14#64029)