How to inspect stats when a kernel feature is disabled?

[gcavalcante8808]

Hi Folks,

In these days, much of the linux kernels running doesnt have the Cgroup Swap support activated and because of this, there is no field called 'swap' for the container stats. When I try to gather some container stats with the following code

    for container in &containers {
        let _stats = match docker.stats(container) {
            Ok(stats) => stats,
            Err(e) => { panic!("{}", e); }
        };

        for stat in _stats{
            println!("{:?}", stat);
        }
    }

It returns to me the message "(Some(Error("missing field swap", line: 1, column: 4183)), None)))".

Thanks in advance.

[fussybeaver]

Take a look at https://github.com/faradayio/boondock/pull/20 , perhaps that fixes the error..

[gcavalcante8808]

Yeah, I can confirm that. In my case, the following changes on structs fixed the problem:

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Stats {
    pub read: String,
    pub network: Option<Network>,
    pub memory_stats: MemoryStats,
    pub cpu_stats: CpuStats,
    pub blkio_stats: BlkioStats
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct MemoryStat {
    pub total_pgmajfault: u64,
    pub cache: u64,
    pub mapped_file: u64,
    pub total_inactive_file: u64,
    pub pgpgout: u64,
    pub rss: u64,
    pub total_mapped_file: u64,
    pub writeback: u64,
    pub unevictable: u64,
    pub pgpgin: u64,
    pub total_unevictable: u64,
    pub pgmajfault: u64,
    pub total_rss: u64,
    pub total_rss_huge: u64,
    pub total_writeback: u64,
    pub total_inactive_anon: u64,
    pub rss_huge: u64,
    pub hierarchical_memory_limit: u64,
    pub hierarchical_memsw_limit: u64,
    pub total_pgfault: u64,
    pub total_active_file: u64,
    pub active_anon: u64,
    pub total_active_anon: u64,
    pub total_pgpgout: u64,
    pub total_cache: u64,
    pub inactive_anon: u64,
    pub active_file: u64,
    pub pgfault: u64,
    pub inactive_file: u64,
    pub total_pgpgin: u64,
    pub swap: Option<u64>,
    pub total_swap: Option<u64>
}

As I can see, there is no conflicts on the https://github.com/faradayio/boondock/pull/20 PR. Is there any plans to merge it?

[emk]

Thank you for figuring this out!

Please see my note on this PR about the maintenance schedule for boondock: https://github.com/faradayio/boondock/pull/21. TL;dr: I've been juggling other stuff lately, but I hope to get back around to it soon.