我尝试使用以下命令拉出Fedora docker镜像,但它失败并Tag latest not found in repository docker.io/library/fedora出现错误:
# docker pull fedora
Using default tag: latest
latest: Pulling from library/fedora
62b0615068df: Pull complete
cd1e9127a3f8: Verifying Checksum
Pulling repository docker.io/library/fedora
Tag latest not found in repository docker.io/library/fedora
但是,当我使用latest明确指定的标记将其拉出时,它成功了.
docker pull fedora:latest
latest: Pulling from library/fedora
cd1e9127a3f8: Pull complete
Digest: sha256:52db7a1a18f173622a9b1a75354c7266220bffb7187c4880590805af0d7679d6
Status: Downloaded newer image for fedora:latest
为了进一步理解这一点,我试图拉动CentOS docker镜像.但是,在CentOS的情况下,我没有看到这种行为:
docker pull centos
Using default tag: latest
latest: Pulling from library/centos
Digest: sha256:1a62cd7c773dd5c6cf08e2e28596f6fcc99bd97e38c9b324163e0da90ed27562
Status: Downloaded newer image for centos:latest …我面临一个奇怪的链接器问题clang ++ - 它能够找到std :: string类的定义,而不是std :: ios_base :: failure class的定义.
$ cat foo.cpp
#include <string>
#include <iostream>
int main()
{
std::string msg = "hello world";
std::ios_base::failure f(msg);
std::cout << msg << std::endl;
return 0;
}
$ clang++ foo.cpp
/tmp/foo-b77625.o: In function `main':
foo.cpp:(.text+0x4d): undefined reference to `std::ios_base::failure::failure(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'
clang-3.7: error: linker command failed with exit code 1 (use -v to see invocation)
$ clang++ --version
clang version 3.7.0 (trunk 239466)
Target: x86_64-unknown-linux-gnu
Thread model: posix
我注意到如果我评论std …