Linux
為什麼第一個 Docker exec 中缺少文件但在第二個中可用？
這是一個非常奇怪的情況。我們在 Travis CI 上執行一個基於 alpine 的 docker 容器。然後我們執行
ls如下：docker exec $CONTAINER_NAME ls -la specific/directory docker exec $CONTAINER_NAME ls -la specific/directory第一個命令顯示文件列表，但缺少一些應該存在的文件（建構圖像的一部分，並且在其他平台上調查時確實存在於圖像中）。
範例輸出：請注意中的數字
file_#total 108 -rw-rw-r-- 1 nginx nginx 2069 Oct 21 06:08 2018_01_10_101010_file_1_here.php -rw-rw-r-- 1 nginx nginx 1586 Oct 21 06:08 2018_01_12_101010_file_3_here.php -rw-rw-r-- 1 nginx nginx 1649 Oct 21 06:08 2018_01_13_101010_file_4_here.php -rw-rw-r-- 1 nginx nginx 1490 Oct 21 06:08 2018_01_14_101010_file_5_here.php -rw-rw-r-- 1 nginx nginx 946 Oct 21 06:08 2018_01_15_101010_file_6_here.php -rw-rw-r-- 1 nginx nginx 2379 Oct 21 06:08 2018_01_16_101010_file_7_here.php第二個命令按預期顯示完整的文件列表。
total 192 drwxrwxr-x 1 nginx nginx 4096 Oct 21 06:08 . drwxrwxr-x 1 nginx nginx 4096 Oct 21 06:08 .. -rw-rw-r-- 1 nginx nginx 2069 Oct 21 06:08 2018_01_10_101010_file_1_here.php -rw-rw-r-- 1 nginx nginx 1758 Oct 21 06:08 2018_01_11_101010_file_2_here.php -rw-rw-r-- 1 nginx nginx 1586 Oct 21 06:08 2018_01_12_101010_file_3_here.php -rw-rw-r-- 1 nginx nginx 1649 Oct 21 06:08 2018_01_13_101010_file_4_here.php -rw-rw-r-- 1 nginx nginx 1490 Oct 21 06:08 2018_01_14_101010_file_5_here.php -rw-rw-r-- 1 nginx nginx 946 Oct 21 06:08 2018_01_15_101010_file_6_here.php -rw-rw-r-- 1 nginx nginx 2379 Oct 21 06:08 2018_01_16_101010_file_7_here.php -rw-rw-r-- 1 nginx nginx 1583 Oct 21 06:08 2018_01_17_101010_file_8_here.php -rw-rw-r-- 1 nginx nginx 920 Oct 21 06:08 2018_01_18_101010_file_9_here.php我還注意到第一個命令沒有顯示
.and..目錄。為什麼會這樣？以及如何避免？
順便說一句：它不僅發生在
ls. 當應用程式碼第一次嘗試列出文件時，它會顯示縮減列表。但再次列出它們會顯示完整列表！以下是@DanilaKiver 和@ClemensKaserer 提出的更多調試命令
輸出
docker info：Containers: 4 Running: 4 Paused: 0 Stopped: 0 Images: 30 Server Version: 18.06.0-ce Storage Driver: overlay2 Backing Filesystem: extfs Supports d_type: true Native Overlay Diff: true Logging Driver: json-file Cgroup Driver: cgroupfs Plugins: Volume: local Network: bridge host macvlan null overlay Log: awslogs fluentd gcplogs gelf journald json-file logentries splunk syslog Swarm: inactive Runtimes: runc Default Runtime: runc Init Binary: docker-init containerd version: d64c661f1d51c48782c9cec8fda7604785f93587 runc version: 69663f0bd4b60df09991c08812a60108003fa340 init version: fec3683 Security Options: seccomp Profile: default Kernel Version: 4.15.0-1028-gcp Operating System: Ubuntu 16.04.6 LTS OSType: linux Architecture: x86_64 CPUs: 2 Total Memory: 7.298GiB Name: travis-job-8895eb3f-fd49-4241-af47-47daddf7beb5 ID: AVP5:DERI:ZI6V:ZTOR:KAAL:SPUS:ZQHT:NOOK:6IFE:VCFZ:CHL4:3QAK Docker Root Dir: /var/lib/docker Debug Mode (client): false Debug Mode (server): false Registry: https://index.docker.io/v1/ Labels: Experimental: false Insecure Registries: 127.0.0.0/8 Registry Mirrors: https://mirror.gcr.io/ Live Restore Enabled: false執行以下：
dmesg | grep ovl docker exec $CONTAINER_NAME sync & ls -la specific/directory docker exec $CONTAINER_NAME ls -la specific/directory docker exec $CONTAINER_NAME ls -la specific/directory dmesg | grep ovl docker exec $CONTAINER_NAME dmesg | grep ovl給出：
# dmesg | grep ovl [ 178.665709] WARNING: CPU: 1 PID: 8854 at /build/linux-gcp-yd4gNt/linux-gcp-4.15.0/fs/overlayfs/readdir.c:417 ovl_iterate+0x25d/0x270 [overlay] [ 178.665761] RIP: 0010:ovl_iterate+0x25d/0x270 [overlay] [ 178.730507] WARNING: CPU: 0 PID: 9214 at /build/linux-gcp-yd4gNt/linux-gcp-4.15.0/fs/overlayfs/readdir.c:417 ovl_iterate+0x25d/0x270 [overlay] [ 178.730554] RIP: 0010:ovl_iterate+0x25d/0x270 [overlay] [ 178.777656] WARNING: CPU: 0 PID: 9214 at /build/linux-gcp-yd4gNt/linux-gcp-4.15.0/fs/overlayfs/readdir.c:417 ovl_iterate+0x25d/0x270 [overlay] [ 178.777707] RIP: 0010:ovl_iterate+0x25d/0x270 [overlay] # docker exec $CONTAINER_NAME sync & ls -la specific/directory total 184 drwxrwxr-x 2 travis travis 4096 Oct 21 11:38 . drwxrwxr-x 5 travis travis 4096 Oct 21 11:38 .. -rw-rw-r-- 1 travis travis 1156 Oct 21 11:38 2018_04_18_000001_file_01_here.php -rw-rw-r-- 1 travis travis 1758 Oct 21 11:38 2018_04_18_000001_file_02_here.php -rw-rw-r-- 1 travis travis 1598 Oct 21 11:38 2018_04_18_000001_file_03_here.php -rw-rw-r-- 1 travis travis 1661 Oct 21 11:38 2018_04_18_000001_file_04_here.php -rw-rw-r-- 1 travis travis 1502 Oct 21 11:38 2018_04_18_000001_file_05_here.php -rw-rw-r-- 1 travis travis 958 Oct 21 11:38 2018_04_18_000001_file_06_here.php -rw-rw-r-- 1 travis travis 2391 Oct 21 11:38 2018_04_18_000001_file_07_here.php -rw-rw-r-- 1 travis travis 1583 Oct 21 11:38 2018_04_18_000001_file_08_here.php -rw-rw-r-- 1 travis travis 932 Oct 21 11:38 2018_04_18_000001_file_09_here.php -rw-rw-r-- 1 travis travis 1947 Oct 21 11:38 2018_04_18_000001_file_10_here.php -rw-rw-r-- 1 travis travis 1484 Oct 21 11:38 2018_04_18_000001_file_11_here.php -rw-rw-r-- 1 travis travis 1026 Oct 21 11:38 2018_04_18_000001_file_12_here.php -rw-rw-r-- 1 travis travis 2170 Oct 21 11:38 2018_04_18_000001_file_13_here.php -rw-rw-r-- 1 travis travis 1683 Oct 21 11:38 2018_04_18_000001_file_14_here.php -rw-rw-r-- 1 travis travis 999 Oct 21 11:38 2018_04_18_000001_file_15_here.php -rw-rw-r-- 1 travis travis 1477 Oct 21 11:38 2018_04_18_000001_file_16_here.php -rw-rw-r-- 1 travis travis 1687 Oct 21 11:38 2018_04_18_000001_file_17_here.php -rw-rw-r-- 1 travis travis 1619 Oct 21 11:38 2018_04_18_000001_file_18_here.php -rw-rw-r-- 1 travis travis 1954 Oct 21 11:38 2018_04_18_000001_file_19_here.php -rw-rw-r-- 1 travis travis 1203 Oct 21 11:38 2018_04_18_000001_file_20_here.php -rw-rw-r-- 1 travis travis 1024 Oct 21 11:38 2018_04_18_000001_file_21_here.php -rw-rw-r-- 1 travis travis 1290 Oct 21 11:38 2018_04_18_000001_file_22_here.php -rw-rw-r-- 1 travis travis 1675 Oct 21 11:38 2018_04_18_000001_file_23_here.php -rw-rw-r-- 1 travis travis 1411 Oct 21 11:38 2018_04_18_000001_file_24_here.php -rw-rw-r-- 1 travis travis 1566 Oct 21 11:38 2018_04_18_000001_file_25_here.php -rw-rw-r-- 1 travis travis 958 Oct 21 11:38 2018_04_18_000001_file_26_here.php -rw-rw-r-- 1 travis travis 1122 Oct 21 11:38 2018_04_18_000001_file_27_here.php -rw-rw-r-- 1 travis travis 1131 Oct 21 11:38 2018_04_18_000001_file_28_here.php -rw-rw-r-- 1 travis travis 3034 Oct 21 11:38 2018_04_18_000001_file_29_here.php -rw-rw-r-- 1 travis travis 1866 Oct 21 11:38 2018_04_18_000001_file_30_here.php -rw-rw-r-- 1 travis travis 2068 Oct 21 11:38 2018_04_18_000001_file_31_here.php -rw-rw-r-- 1 travis travis 991 Oct 21 11:38 2018_04_18_000001_file_32_here.php -rw-rw-r-- 1 travis travis 995 Oct 21 11:38 2018_04_18_000001_file_33_here.php -rw-rw-r-- 1 travis travis 933 Oct 21 11:38 2018_04_18_000001_file_34_here.php -rw-rw-r-- 1 travis travis 2238 Oct 21 11:38 2018_04_18_000001_file_35_here.php -rw-rw-r-- 1 travis travis 943 Oct 21 11:38 2018_04_18_000001_file_36_here.php -rw-rw-r-- 1 travis travis 1765 Oct 21 11:38 2018_04_18_000001_file_37_here.php -rw-rw-r-- 1 travis travis 2895 Oct 21 11:38 2018_04_18_000001_file_38_here.php -rw-rw-r-- 1 travis travis 1501 Oct 21 11:38 2018_04_18_000001_file_39_here.php -rw-rw-r-- 1 travis travis 1444 Oct 21 11:38 2018_04_18_000001_file_40_here.php -rw-rw-r-- 1 travis travis 1722 Oct 21 11:38 2018_04_18_000001_file_41_here.php -rw-rw-r-- 1 travis travis 1404 Oct 21 11:38 2018_04_18_000001_file_42_here.php -rw-rw-r-- 1 travis travis 941 Oct 21 11:38 2018_04_18_000001_file_43_here.php -rw-rw-r-- 1 travis travis 919 Oct 21 11:38 2018_04_18_000001_file_44_here.php # docker exec $CONTAINER_NAME ls -la specific/directory total 140 -rw-rw-r-- 1 nginx nginx 1758 Oct 21 11:38 2018_04_18_000001_file_02_here.php -rw-rw-r-- 1 nginx nginx 1598 Oct 21 11:38 2018_04_18_000001_file_03_here.php -rw-rw-r-- 1 nginx nginx 1661 Oct 21 11:38 2018_04_18_000001_file_04_here.php -rw-rw-r-- 1 nginx nginx 1502 Oct 21 11:38 2018_04_18_000001_file_05_here.php -rw-rw-r-- 1 nginx nginx 958 Oct 21 11:38 2018_04_18_000001_file_06_here.php -rw-rw-r-- 1 nginx nginx 2391 Oct 21 11:38 2018_04_18_000001_file_07_here.php -rw-rw-r-- 1 nginx nginx 1583 Oct 21 11:38 2018_04_18_000001_file_08_here.php -rw-rw-r-- 1 nginx nginx 1484 Oct 21 11:38 2018_04_18_000001_file_11_here.php -rw-rw-r-- 1 nginx nginx 1026 Oct 21 11:38 2018_04_18_000001_file_12_here.php -rw-rw-r-- 1 nginx nginx 2170 Oct 21 11:38 2018_04_18_000001_file_13_here.php -rw-rw-r-- 1 nginx nginx 1683 Oct 21 11:38 2018_04_18_000001_file_14_here.php -rw-rw-r-- 1 nginx nginx 1477 Oct 21 11:38 2018_04_18_000001_file_16_here.php -rw-rw-r-- 1 nginx nginx 1687 Oct 21 11:38 2018_04_18_000001_file_17_here.php -rw-rw-r-- 1 nginx nginx 1954 Oct 21 11:38 2018_04_18_000001_file_19_here.php -rw-rw-r-- 1 nginx nginx 1203 Oct 21 11:38 2018_04_18_000001_file_20_here.php -rw-rw-r-- 1 nginx nginx 1024 Oct 21 11:38 2018_04_18_000001_file_21_here.php -rw-rw-r-- 1 nginx nginx 1290 Oct 21 11:38 2018_04_18_000001_file_22_here.php -rw-rw-r-- 1 nginx nginx 1675 Oct 21 11:38 2018_04_18_000001_file_23_here.php -rw-rw-r-- 1 nginx nginx 1411 Oct 21 11:38 2018_04_18_000001_file_24_here.php -rw-rw-r-- 1 nginx nginx 1566 Oct 21 11:38 2018_04_18_000001_file_25_here.php -rw-rw-r-- 1 nginx nginx 958 Oct 21 11:38 2018_04_18_000001_file_26_here.php -rw-rw-r-- 1 nginx nginx 1122 Oct 21 11:38 2018_04_18_000001_file_27_here.php -rw-rw-r-- 1 nginx nginx 1131 Oct 21 11:38 2018_04_18_000001_file_28_here.php -rw-rw-r-- 1 nginx nginx 2068 Oct 21 11:38 2018_04_18_000001_file_31_here.php -rw-rw-r-- 1 nginx nginx 991 Oct 21 11:38 2018_04_18_000001_file_32_here.php -rw-rw-r-- 1 nginx nginx 995 Oct 21 11:38 2018_04_18_000001_file_33_here.php -rw-rw-r-- 1 nginx nginx 933 Oct 21 11:38 2018_04_18_000001_file_34_here.php -rw-rw-r-- 1 nginx nginx 2238 Oct 21 11:38 2018_04_18_000001_file_35_here.php -rw-rw-r-- 1 nginx nginx 943 Oct 21 11:38 2018_04_18_000001_file_36_here.php -rw-rw-r-- 1 nginx nginx 2895 Oct 21 11:38 2018_04_18_000001_file_38_here.php -rw-rw-r-- 1 nginx nginx 1501 Oct 21 11:38 2018_04_18_000001_file_39_here.php -rw-rw-r-- 1 nginx nginx 1444 Oct 21 11:38 2018_04_18_000001_file_40_here.php -rw-rw-r-- 1 nginx nginx 1722 Oct 21 11:38 2018_04_18_000001_file_41_here.php -rw-rw-r-- 1 nginx nginx 1404 Oct 21 11:38 2018_04_18_000001_file_42_here.php -rw-rw-r-- 1 nginx nginx 941 Oct 21 11:38 2018_04_18_000001_file_43_here.php # docker exec $CONTAINER_NAME ls -la specific/directory total 192 drwxrwxr-x 1 nginx nginx 4096 Oct 21 11:38 . drwxrwxr-x 1 nginx nginx 4096 Oct 21 11:38 .. -rw-rw-r-- 1 nginx nginx 1156 Oct 21 11:38 2018_04_18_000001_file_01_here.php -rw-rw-r-- 1 nginx nginx 1758 Oct 21 11:38 2018_04_18_000001_file_02_here.php -rw-rw-r-- 1 nginx nginx 1598 Oct 21 11:38 2018_04_18_000001_file_03_here.php -rw-rw-r-- 1 nginx nginx 1661 Oct 21 11:38 2018_04_18_000001_file_04_here.php -rw-rw-r-- 1 nginx nginx 1502 Oct 21 11:38 2018_04_18_000001_file_05_here.php -rw-rw-r-- 1 nginx nginx 958 Oct 21 11:38 2018_04_18_000001_file_06_here.php -rw-rw-r-- 1 nginx nginx 2391 Oct 21 11:38 2018_04_18_000001_file_07_here.php -rw-rw-r-- 1 nginx nginx 1583 Oct 21 11:38 2018_04_18_000001_file_08_here.php -rw-rw-r-- 1 nginx nginx 932 Oct 21 11:38 2018_04_18_000001_file_09_here.php -rw-rw-r-- 1 nginx nginx 1947 Oct 21 11:38 2018_04_18_000001_file_10_here.php -rw-rw-r-- 1 nginx nginx 1484 Oct 21 11:38 2018_04_18_000001_file_11_here.php -rw-rw-r-- 1 nginx nginx 1026 Oct 21 11:38 2018_04_18_000001_file_12_here.php -rw-rw-r-- 1 nginx nginx 2170 Oct 21 11:38 2018_04_18_000001_file_13_here.php -rw-rw-r-- 1 nginx nginx 1683 Oct 21 11:38 2018_04_18_000001_file_14_here.php -rw-rw-r-- 1 nginx nginx 999 Oct 21 11:38 2018_04_18_000001_file_15_here.php -rw-rw-r-- 1 nginx nginx 1477 Oct 21 11:38 2018_04_18_000001_file_16_here.php -rw-rw-r-- 1 nginx nginx 1687 Oct 21 11:38 2018_04_18_000001_file_17_here.php -rw-rw-r-- 1 nginx nginx 1619 Oct 21 11:38 2018_04_18_000001_file_18_here.php -rw-rw-r-- 1 nginx nginx 1954 Oct 21 11:38 2018_04_18_000001_file_19_here.php -rw-rw-r-- 1 nginx nginx 1203 Oct 21 11:38 2018_04_18_000001_file_20_here.php -rw-rw-r-- 1 nginx nginx 1024 Oct 21 11:38 2018_04_18_000001_file_21_here.php -rw-rw-r-- 1 nginx nginx 1290 Oct 21 11:38 2018_04_18_000001_file_22_here.php -rw-rw-r-- 1 nginx nginx 1675 Oct 21 11:38 2018_04_18_000001_file_23_here.php -rw-rw-r-- 1 nginx nginx 1411 Oct 21 11:38 2018_04_18_000001_file_24_here.php -rw-rw-r-- 1 nginx nginx 1566 Oct 21 11:38 2018_04_18_000001_file_25_here.php -rw-rw-r-- 1 nginx nginx 958 Oct 21 11:38 2018_04_18_000001_file_26_here.php -rw-rw-r-- 1 nginx nginx 1122 Oct 21 11:38 2018_04_18_000001_file_27_here.php -rw-rw-r-- 1 nginx nginx 1131 Oct 21 11:38 2018_04_18_000001_file_28_here.php -rw-rw-r-- 1 nginx nginx 3034 Oct 21 11:38 2018_04_18_000001_file_29_here.php -rw-rw-r-- 1 nginx nginx 1866 Oct 21 11:38 2018_04_18_000001_file_30_here.php -rw-rw-r-- 1 nginx nginx 2068 Oct 21 11:38 2018_04_18_000001_file_31_here.php -rw-rw-r-- 1 nginx nginx 991 Oct 21 11:38 2018_04_18_000001_file_32_here.php -rw-rw-r-- 1 nginx nginx 995 Oct 21 11:38 2018_04_18_000001_file_33_here.php -rw-rw-r-- 1 nginx nginx 933 Oct 21 11:38 2018_04_18_000001_file_34_here.php -rw-rw-r-- 1 nginx nginx 2238 Oct 21 11:38 2018_04_18_000001_file_35_here.php -rw-rw-r-- 1 nginx nginx 943 Oct 21 11:38 2018_04_18_000001_file_36_here.php -rw-rw-r-- 1 nginx nginx 1765 Oct 21 11:38 2018_04_18_000001_file_37_here.php -rw-rw-r-- 1 nginx nginx 2895 Oct 21 11:38 2018_04_18_000001_file_38_here.php -rw-rw-r-- 1 nginx nginx 1501 Oct 21 11:38 2018_04_18_000001_file_39_here.php -rw-rw-r-- 1 nginx nginx 1444 Oct 21 11:38 2018_04_18_000001_file_40_here.php -rw-rw-r-- 1 nginx nginx 1722 Oct 21 11:38 2018_04_18_000001_file_41_here.php -rw-rw-r-- 1 nginx nginx 1404 Oct 21 11:38 2018_04_18_000001_file_42_here.php -rw-rw-r-- 1 nginx nginx 941 Oct 21 11:38 2018_04_18_000001_file_43_here.php -rw-rw-r-- 1 nginx nginx 919 Oct 21 11:38 2018_04_18_000001_file_44_here.php # dmesg | grep ovl [ 178.665709] WARNING: CPU: 1 PID: 8854 at /build/linux-gcp-yd4gNt/linux-gcp-4.15.0/fs/overlayfs/readdir.c:417 ovl_iterate+0x25d/0x270 [overlay] [ 178.665761] RIP: 0010:ovl_iterate+0x25d/0x270 [overlay] [ 178.730507] WARNING: CPU: 0 PID: 9214 at /build/linux-gcp-yd4gNt/linux-gcp-4.15.0/fs/overlayfs/readdir.c:417 ovl_iterate+0x25d/0x270 [overlay] [ 178.730554] RIP: 0010:ovl_iterate+0x25d/0x270 [overlay] [ 178.777656] WARNING: CPU: 0 PID: 9214 at /build/linux-gcp-yd4gNt/linux-gcp-4.15.0/fs/overlayfs/readdir.c:417 ovl_iterate+0x25d/0x270 [overlay] [ 178.777707] RIP: 0010:ovl_iterate+0x25d/0x270 [overlay] [ 213.441060] WARNING: CPU: 1 PID: 9378 at /build/linux-gcp-yd4gNt/linux-gcp-4.15.0/fs/overlayfs/readdir.c:417 ovl_iterate+0x25d/0x270 [overlay] [ 213.441107] RIP: 0010:ovl_iterate+0x25d/0x270 [overlay] # docker exec $CONTAINER_NAME dmesg | grep ovl [ 178.665709] WARNING: CPU: 1 PID: 8854 at /build/linux-gcp-yd4gNt/linux-gcp-4.15.0/fs/overlayfs/readdir.c:417 ovl_iterate+0x25d/0x270 [overlay] [ 178.665761] RIP: 0010:ovl_iterate+0x25d/0x270 [overlay] [ 178.730507] WARNING: CPU: 0 PID: 9214 at /build/linux-gcp-yd4gNt/linux-gcp-4.15.0/fs/overlayfs/readdir.c:417 ovl_iterate+0x25d/0x270 [overlay] [ 178.730554] RIP: 0010:ovl_iterate+0x25d/0x270 [overlay] [ 178.777656] WARNING: CPU: 0 PID: 9214 at /build/linux-gcp-yd4gNt/linux-gcp-4.15.0/fs/overlayfs/readdir.c:417 ovl_iterate+0x25d/0x270 [overlay] [ 178.777707] RIP: 0010:ovl_iterate+0x25d/0x270 [overlay] [ 213.441060] WARNING: CPU: 1 PID: 9378 at /build/linux-gcp-yd4gNt/linux-gcp-4.15.0/fs/overlayfs/readdir.c:417 ovl_iterate+0x25d/0x270 [overlay] [ 213.441107] RIP: 0010:ovl_iterate+0x25d/0x270 [overlay]更新：
此問題發生在 Ubuntu Xenial 16.04 上，但不會發生在 Ubuntu Bionic 18.04 上。所以，這似乎是核心中的一個錯誤，並在以後的版本中得到了解決。
此問題發生在 Ubuntu Xenial 16.04 上，但不會發生在 Ubuntu Bionic 18.04 上。所以，這似乎是核心中的一個錯誤，並在以後的版本中得到了解決。
@DanilaKiver 還提到了這個可能與同一問題有關的修復送出。