diff --git a/lib/common.sh b/lib/common.sh
index 931db29..9663a64 100644
--- a/lib/common.sh
+++ b/lib/common.sh
@@ -14,10 +14,11 @@ DIST=${DIST:-buster}
 # Yunohost version: stable, testing or unstable
 YNH_BRANCH=${YNH_BRANCH:-stable}
 
+WORKER_ID=${WORKER_ID:-0}
 LXC_BASE="ynh-appci-$DIST-$ARCH-$YNH_BRANCH-base"
-LXC_NAME="ynh-appci-$DIST-$ARCH-$YNH_BRANCH-test"
+LXC_NAME="ynh-appci-$DIST-$ARCH-$YNH_BRANCH-test-${WORKER_ID}"
 
-readonly lock_file="./pcheck.lock"
+readonly lock_file="./pcheck-${WORKER_ID}.lock"
 
 DEFAULT_PHP_VERSION="7.3"
 [[ "$DIST" == "bullseye" ]] && DEFAULT_PHP_VERSION="7.4"
diff --git a/lib/lxc.sh b/lib/lxc.sh
index f7b3049..03fcb97 100644
--- a/lib/lxc.sh
+++ b/lib/lxc.sh
@@ -25,7 +25,12 @@ LXC_CREATE () {
     else
         log_critical "Can't find base image $LXC_BASE, run ./package_check.sh --rebuild"
     fi
-    [[ "${PIPESTATUS[0]}" -eq 0 ]] || exit 1
+    
+    pipestatus="${PIPESTATUS[0]}"
+    location=$(lxc list --format json | jq -e --arg LXC_NAME $LXC_NAME '.[] | select(.name==$LXC_NAME) | .location' | tr -d '"')
+    [[ "$location" != "none" ]] && log_info "... on $location"
+
+    [[ "$pipestatus" -eq 0 ]] || exit 1
 
     _LXC_START_AND_WAIT $LXC_NAME
     set_witness_files
diff --git a/lib/tests.sh b/lib/tests.sh
index 267bd4f..7d126ad 100644
--- a/lib/tests.sh
+++ b/lib/tests.sh
@@ -187,16 +187,18 @@ _VALIDATE_THAT_APP_CAN_BE_ACCESSED () {
             log_debug "Running curl $check_domain$curl_check_path"
 
             # Call cURL to try to access to the URL of the app
-            curl --location --insecure --silent --show-error \
-                --header "Host: $check_domain" \
+            LXC_EXEC "curl --location --insecure --silent --show-error \
+                --header 'Host: $check_domain' \
                 --resolve $DOMAIN:80:$LXC_IP \
                 --resolve $DOMAIN:443:$LXC_IP \
                 --resolve $SUBDOMAIN:80:$LXC_IP \
                 --resolve $SUBDOMAIN:443:$LXC_IP \
-                --write-out "%{http_code};%{url_effective}\n" \
-                --output "$curl_output" \
-                $check_domain$curl_check_path \
-                > "./curl_print"
+                --write-out '%{http_code};%{url_effective}\n' \
+                --output './curl_output' \
+                $check_domain$curl_check_path" \
+                > "$TEST_CONTEXT/curl_print"
+            
+            LXC_EXEC "cat ./curl_output" > $curl_output
 
             # Analyze the result of curl command
             if [ $? -ne 0 ]
@@ -205,7 +207,7 @@ _VALIDATE_THAT_APP_CAN_BE_ACCESSED () {
                 curl_error=1
             fi
 
-            http_code=$(cat "./curl_print" | cut -d ';' -f1)
+            http_code=$(cat "$TEST_CONTEXT/curl_print" | cut -d ';' -f1)
 
             log_debug "HTTP code: $http_code"
 
@@ -245,7 +247,7 @@ _VALIDATE_THAT_APP_CAN_BE_ACCESSED () {
         fi
 
         echo -e "Test URL: $check_domain$curl_check_path
-Real URL: $(cat "./curl_print" | cut --delimiter=';' --fields=2)
+Real URL: $(cat "$TEST_CONTEXT/curl_print" | cut --delimiter=';' --fields=2)
 HTTP code: $http_code
 Page title: $page_title
 Page extract:\n$page_extract" > $TEST_CONTEXT/curl_result
diff --git a/lib/tests_coordination.sh b/lib/tests_coordination.sh
index 1e81022..70d748c 100644
--- a/lib/tests_coordination.sh
+++ b/lib/tests_coordination.sh
@@ -4,7 +4,7 @@ source lib/lxc.sh
 source lib/tests.sh
 source lib/witness.sh
 
-complete_log="./Complete.log"
+readonly complete_log="./Complete-${WORKER_ID}.log"
 
 # Purge some log files
 rm -f "$complete_log" && touch "$complete_log"
@@ -295,7 +295,7 @@ run_all_tests() {
     # Print the final results of the tests
     log_title "Tests summary"
 
-    python3 lib/analyze_test_results.py $TEST_CONTEXT 2>./results.json
+    python3 lib/analyze_test_results.py $TEST_CONTEXT 2> ./results-${WORKER_ID}.json
     [[ -e "$TEST_CONTEXT/summary.png" ]] && cp "$TEST_CONTEXT/summary.png" ./summary.png || rm -f summary.png
 
     # Restore the started time for the timer