ae7b4f9b9e
A lot of libvirt interactions with QEMU are via the QEMU monitor console, which allows you to either query or modify the state of a virtual machine. Spefici examples include: querying the status of live block operations, live snapshot operations, live migration, etc. Enabling the 'qemu_monitor' log filter allows us to capture precisely what commands libvirt is sending to QEMU. Note that the log level was intentionally set to '1' (i.e. debug) for this specific filter, because (a) it's not extremely verbose, (b) when something breaks, it's helpful to have the exact sequence of interactions between libvirt and QEMU. Change-Id: Iba95b6bd7c9f197c8d48c7d978f538e50d4e31fa
128 lines
4.4 KiB
Bash
128 lines
4.4 KiB
Bash
#!/bin/bash
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#
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# lib/nova_plugins/functions-libvirt
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# Common libvirt configuration functions
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# Dependencies:
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# ``functions`` file
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# ``STACK_USER`` has to be defined
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# Save trace setting
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LV_XTRACE=$(set +o | grep xtrace)
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set +o xtrace
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# Defaults
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# --------
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# if we should turn on massive libvirt debugging
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DEBUG_LIBVIRT=$(trueorfalse False DEBUG_LIBVIRT)
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# Installs required distro-specific libvirt packages.
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function install_libvirt {
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if is_ubuntu; then
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install_package qemu-kvm
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install_package libvirt-bin libvirt-dev
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pip_install libvirt-python
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install_package libguestfs0
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install_package python-guestfs
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#pip_install <there-si-no-guestfs-in-pypi>
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elif is_fedora || is_suse; then
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install_package kvm
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install_package libvirt libvirt-devel
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pip_install libvirt-python
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install_package python-libguestfs
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fi
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# Restart firewalld after install of libvirt to avoid a problem
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# with polkit, which libvirtd brings in. See
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# https://bugzilla.redhat.com/show_bug.cgi?id=1099031
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# Note there is a difference between F20 rackspace cloud images
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# and HP images used in the gate; rackspace has firewalld but hp
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# cloud doesn't.
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if is_fedora && is_package_installed firewalld; then
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sudo service firewalld restart || true
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fi
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}
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# Configures the installed libvirt system so that is accessible by
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# STACK_USER via qemu:///system with management capabilities.
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function configure_libvirt {
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if is_service_enabled neutron && is_neutron_ovs_base_plugin && ! sudo grep -q '^cgroup_device_acl' $QEMU_CONF; then
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# Add /dev/net/tun to cgroup_device_acls, needed for type=ethernet interfaces
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cat <<EOF | sudo tee -a $QEMU_CONF
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cgroup_device_acl = [
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"/dev/null", "/dev/full", "/dev/zero",
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"/dev/random", "/dev/urandom",
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"/dev/ptmx", "/dev/kvm", "/dev/kqemu",
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"/dev/rtc", "/dev/hpet","/dev/net/tun",
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]
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EOF
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fi
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# Since the release of Debian Wheezy the libvirt init script is libvirtd
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# and not libvirtd-bin anymore.
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if is_ubuntu && [ ! -f /etc/init.d/libvirtd ]; then
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LIBVIRT_DAEMON=libvirt-bin
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else
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LIBVIRT_DAEMON=libvirtd
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fi
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if is_fedora || is_suse; then
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# Starting with fedora 18 and opensuse-12.3 enable stack-user to
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# virsh -c qemu:///system by creating a policy-kit rule for
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# stack-user using the new Javascript syntax
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rules_dir=/etc/polkit-1/rules.d
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sudo mkdir -p $rules_dir
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cat <<EOF | sudo tee $rules_dir/50-libvirt-$STACK_USER.rules
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polkit.addRule(function(action, subject) {
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if (action.id == 'org.libvirt.unix.manage' &&
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subject.user == '$STACK_USER') {
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return polkit.Result.YES;
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}
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});
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EOF
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unset rules_dir
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fi
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# The user that nova runs as needs to be member of **libvirtd** group otherwise
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# nova-compute will be unable to use libvirt.
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if ! getent group $LIBVIRT_GROUP >/dev/null; then
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sudo groupadd $LIBVIRT_GROUP
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fi
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add_user_to_group $STACK_USER $LIBVIRT_GROUP
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# Enable server side traces for libvirtd
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if [[ "$DEBUG_LIBVIRT" = "True" ]] ; then
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if is_ubuntu; then
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# Unexpectedly binary package builds in ubuntu get fully qualified
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# source file paths, not relative paths. This screws with the matching
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# of '1:libvirt' making everything turn on. So use libvirt.c for now.
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# This will have to be re-visited when Ubuntu ships libvirt >= 1.2.3
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local log_filters="1:libvirt.c 1:qemu 1:conf 1:security 3:object 3:event 3:json 3:file 1:util 1:qemu_monitor"
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else
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local log_filters="1:libvirt 1:qemu 1:conf 1:security 3:object 3:event 3:json 3:file 1:util 1:qemu_monitor"
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fi
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local log_outputs="1:file:/var/log/libvirt/libvirtd.log"
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if ! grep -q "log_filters=\"$log_filters\"" /etc/libvirt/libvirtd.conf; then
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echo "log_filters=\"$log_filters\"" | sudo tee -a /etc/libvirt/libvirtd.conf
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fi
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if ! grep -q "log_outputs=\"$log_outputs\"" /etc/libvirt/libvirtd.conf; then
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echo "log_outputs=\"$log_outputs\"" | sudo tee -a /etc/libvirt/libvirtd.conf
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fi
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fi
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# libvirt detects various settings on startup, as we potentially changed
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# the system configuration (modules, filesystems), we need to restart
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# libvirt to detect those changes.
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restart_service $LIBVIRT_DAEMON
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}
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# Restore xtrace
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$LV_XTRACE
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# Local variables:
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# mode: shell-script
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# End:
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