diff --git a/vmm/common/Cargo.toml b/vmm/common/Cargo.toml
index 78ad289e..1cc31193 100644
--- a/vmm/common/Cargo.toml
+++ b/vmm/common/Cargo.toml
@@ -28,4 +28,4 @@ opentelemetry-otlp = "0.13.0"
 
 [build-dependencies]
 ttrpc-codegen = { git = "https://github.com/kuasar-io/ttrpc-rust.git", branch = "v0.7.1-kuasar" }
-tonic-build = "0.7.2"
\ No newline at end of file
+tonic-build = "0.7.2"
diff --git a/vmm/common/src/tracer.rs b/vmm/common/src/tracer.rs
index c76fb634..e18c2973 100644
--- a/vmm/common/src/tracer.rs
+++ b/vmm/common/src/tracer.rs
@@ -14,8 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-use opentelemetry::sdk::trace::Tracer;
-use opentelemetry::sdk::{trace, Resource};
+use opentelemetry::sdk::{trace, trace::Tracer, Resource};
 use tracing_subscriber::EnvFilter;
 
 pub fn init_otlp_tracer(otlp_service_name: &str) -> anyhow::Result<Tracer> {
diff --git a/vmm/sandbox/config_clh.toml b/vmm/sandbox/config_clh.toml
index dd9b0207..9622e8bb 100644
--- a/vmm/sandbox/config_clh.toml
+++ b/vmm/sandbox/config_clh.toml
@@ -23,4 +23,4 @@ path = "/usr/local/bin/virtiofsd"
 log_level = "info"
 cache = "never"
 thread_pool_size = 4
-syslog = true
\ No newline at end of file
+syslog = true
diff --git a/vmm/sandbox/src/bin/cloud_hypervisor/main.rs b/vmm/sandbox/src/bin/cloud_hypervisor/main.rs
index 193ba21e..fa8d5386 100644
--- a/vmm/sandbox/src/bin/cloud_hypervisor/main.rs
+++ b/vmm/sandbox/src/bin/cloud_hypervisor/main.rs
@@ -17,8 +17,7 @@ limitations under the License.
 use clap::Parser;
 use opentelemetry::global;
 use tracing::{info, info_span};
-use tracing_subscriber::Layer;
-use tracing_subscriber::{layer::SubscriberExt, Registry};
+use tracing_subscriber::{layer::SubscriberExt, Layer, Registry};
 use vmm_common::tracer::{init_logger_filter, init_otlp_tracer};
 use vmm_sandboxer::{
     args,
@@ -46,7 +45,6 @@ async fn main() {
     if config.sandbox.enable_tracing {
         let tracer = init_otlp_tracer("kuasar-vmm-sandboxer-clh-tracing-service")
             .expect("failed to init otlp tracer");
-
         layers.push(tracing_opentelemetry::layer().with_tracer(tracer).boxed());
     }
 
@@ -65,8 +63,6 @@ async fn main() {
     // Do recovery job
     sandboxer.recover(&args.dir).await;
 
-    info!("Kuasar vmm sandboxer clh is started");
-
     // Run the sandboxer
     containerd_sandbox::run(
         "kuasar-vmm-sandboxer-clh",
@@ -77,8 +73,6 @@ async fn main() {
     .await
     .unwrap();
 
-    info!("Kuasar vmm sandboxer clh is exited");
-
     root_span.exit();
     global::shutdown_tracer_provider();
 }
diff --git a/vmm/sandbox/src/bin/qemu/main.rs b/vmm/sandbox/src/bin/qemu/main.rs
index a9c9bd23..ec217567 100644
--- a/vmm/sandbox/src/bin/qemu/main.rs
+++ b/vmm/sandbox/src/bin/qemu/main.rs
@@ -17,8 +17,7 @@ limitations under the License.
 use clap::Parser;
 use opentelemetry::global;
 use tracing::{info, info_span};
-use tracing_subscriber::Layer;
-use tracing_subscriber::{layer::SubscriberExt, Registry};
+use tracing_subscriber::{layer::SubscriberExt, Layer, Registry};
 use vmm_common::tracer::{init_logger_filter, init_otlp_tracer};
 use vmm_sandboxer::{
     args,
diff --git a/vmm/sandbox/src/bin/stratovirt/main.rs b/vmm/sandbox/src/bin/stratovirt/main.rs
index 395347e1..3ba6b627 100644
--- a/vmm/sandbox/src/bin/stratovirt/main.rs
+++ b/vmm/sandbox/src/bin/stratovirt/main.rs
@@ -17,8 +17,7 @@ limitations under the License.
 use clap::Parser;
 use opentelemetry::global;
 use tracing::{info, info_span};
-use tracing_subscriber::{layer::SubscriberExt, Registry};
-use tracing_subscriber::Layer;
+use tracing_subscriber::{layer::SubscriberExt, Layer, Registry};
 use vmm_common::tracer::{init_logger_filter, init_otlp_tracer};
 use vmm_sandboxer::{
     args,
diff --git a/vmm/sandbox/src/client.rs b/vmm/sandbox/src/client.rs
index 47f7e08d..20e1583c 100644
--- a/vmm/sandbox/src/client.rs
+++ b/vmm/sandbox/src/client.rs
@@ -42,11 +42,11 @@ use tokio::{
     net::UnixStream,
     time::timeout,
 };
+use tracing::{debug, error};
 use ttrpc::{
     context::with_timeout,
     r#async::{Client, TtrpcContext},
 };
-use tracing::{debug, error};
 use vmm_common::api::{
     sandbox::{CheckRequest, SetupSandboxRequest, SyncClockPacket},
     sandbox_ttrpc::SandboxServiceClient,
diff --git a/vmm/task/src/main.rs b/vmm/task/src/main.rs
index ce71cb24..b1bd9ab5 100644
--- a/vmm/task/src/main.rs
+++ b/vmm/task/src/main.rs
@@ -18,6 +18,7 @@ limitations under the License.
 
 use std::{collections::HashMap, convert::TryFrom, path::Path, process::exit, sync::Arc};
 
+use anyhow::anyhow;
 use containerd_shim::{
     asynchronous::{monitor::monitor_notify_by_pid, util::asyncify},
     error::Error,
@@ -177,18 +178,22 @@ async fn initialize() -> anyhow::Result<()> {
 
 fn init_logger(log_level: &str, enable_tracing: bool) -> anyhow::Result<()> {
     let env_filter = EnvFilter::from_default_env()
-        .add_directive(format!("containerd_shim={:?}", log_level).parse()?)
-        .add_directive(format!("vmm_task={:?}", log_level).parse()?);
+        .add_directive(format!("containerd_shim={}", log_level).parse()?)
+        .add_directive(format!("vmm_task={}", log_level).parse()?);
 
     let mut layers = vec![tracing_subscriber::fmt::layer().boxed()];
     if enable_tracing {
-        let tracer = init_otlp_tracer("kuasar-vmm-task-otlp-service")?;
+        let tracer = init_otlp_tracer("kuasar-vmm-task-tracing-service")?;
         layers.push(tracing_opentelemetry::layer().with_tracer(tracer).boxed());
     }
 
     let subscriber = Registry::default().with(env_filter).with(layers);
-    tracing::subscriber::set_global_default(subscriber).expect("unable to set global subscriber");
-
+    match tracing::subscriber::set_global_default(subscriber) {
+        Ok(_) => {}
+        Err(e) => {
+            return Err(anyhow!("failed to set global default subscriber: {}", e));
+        }
+    }
     Ok(())
 }
 
@@ -198,6 +203,7 @@ async fn main() {
         error!("failed to do init call: {:?}", e);
         exit(-1);
     }
+    let root_span = info_span!("kuasar-vmm-task-root").entered();
 
     // Keep server alive in main function
     let mut server = match create_ttrpc_server().await {
@@ -212,7 +218,6 @@ async fn main() {
         exit(-1);
     }
 
-    let root_span = info_span!("kuasar-vmm-task-root").entered();
 
     let signals = match Signals::new([libc::SIGTERM, libc::SIGINT, libc::SIGPIPE, libc::SIGCHLD]) {
         Ok(s) => s,
diff --git a/vmm/task/src/sandbox.rs b/vmm/task/src/sandbox.rs
index f3c12a3d..2cdc9900 100644
--- a/vmm/task/src/sandbox.rs
+++ b/vmm/task/src/sandbox.rs
@@ -29,7 +29,6 @@ use nix::{
 };
 use tokio::fs::File;
 use tracing::{debug, warn};
-
 use vmm_common::{
     mount::{mount, unmount},
     storage::{Storage, DRIVERBLKTYPE, DRIVEREPHEMERALTYPE, DRIVERSCSITYPE},